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add lect 11 code
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‎.gitignore‎

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*.log
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*~
1010
*.swp
11-
fromslides/S11*
1211
fromslides/S12*
1312
fromslides/S13*
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fromslides/S14*

‎fromslides/S06/DataLoss.java‎

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/**
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* This class is the teacher's example of
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* data loss between data types
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* double is 64bits (IEEE 754)
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* float is 32bits (IEEE 754)
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* long is 64bits
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* int is 32bits
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*
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* *
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*
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* @author PMCampbell
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* @version today
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**/
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import java.util.Scanner;
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public class DataLoss {
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public static void main(String[] args) {
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long longVar;
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int intVar, i=0;
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double doubleVar;
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float floatVar;
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longVar = 1000000001;
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i = 0;
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while (i++ < 55 ) {
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System.out.printf("\n long %d == float %f", longVar, (float)longVar);
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longVar++;
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}
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longVar = 10000000001L;
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i = 0;
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while (i++ < 55) {
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System.out.printf("\n long %d == float %f", longVar, (float)longVar);
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longVar++;
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}
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longVar = 1000000001;
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i = 0;
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while (i++ < 55) {
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System.out.printf("\n long %d == double %f", longVar, (double)longVar);
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longVar++;
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}
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double a = 12345.0;
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double b = 1e-16;
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//System.out.printf("a %f + b %f == a %f", a, b, a);
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//System.out.printf("a + b => %f", a + b);
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System.out.println("\na " + a + "\n b " +b );
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System.out.println("a + b => "+ ( a + b ) );
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System.out.println(a + b == a);
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// Roundoff error
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// floating point arithmetic is not exact
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// some real numbers need an infinte number of digits
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// ex: 1/3, natural log, PI
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// surprise 1/10 not exactly representable
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// see this example:
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double x1 = 0.3;
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double x2 = 0.1 + 0.1 + 0.1;
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System.out.println("x1 " + x1);
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System.out.println("x2 " + x2);
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System.out.println("x1 == x2 " + (x1 == x2));
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double z1 = 0.5;
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double z2 = 0.1 + 0.1 + 0.1 + 0.1 + 0.1;
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System.out.println("z1 " + z1);
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System.out.println("z2 " + z2);
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System.out.println("z1 == z2 " + (z1 == z2));
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} // main()
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} // DataLoss

‎fromslides/S06/output.txt‎

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long 1000000001 == float 1000000000.000000
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long 1000000002 == float 1000000000.000000
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long 1000000003 == float 1000000000.000000
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long 1000000004 == float 1000000000.000000
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long 1000000005 == float 1000000000.000000
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long 10000000001 == float 10000000000.000000
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long 10000000002 == float 10000000000.000000
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long 10000000003 == float 10000000000.000000
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long 10000000004 == float 10000000000.000000
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long 10000000005 == float 10000000000.000000
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long 10000000006 == float 10000000000.000000
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long 10000000007 == float 10000000000.000000
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long 10000000008 == float 10000000000.000000
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long 10000000009 == float 10000000000.000000
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long 10000000010 == float 10000000000.000000
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long 10000000011 == float 10000000000.000000
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long 10000000012 == float 10000000000.000000
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long 10000000013 == float 10000000000.000000
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long 10000000014 == float 10000000000.000000
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long 10000000015 == float 10000000000.000000
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long 10000000016 == float 10000000000.000000
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long 10000000017 == float 10000000000.000000
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long 10000000018 == float 10000000000.000000
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long 10000000019 == float 10000000000.000000
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long 10000000020 == float 10000000000.000000
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long 10000000021 == float 10000000000.000000
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long 10000000022 == float 10000000000.000000
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long 10000000023 == float 10000000000.000000
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long 10000000024 == float 10000000000.000000
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long 10000000025 == float 10000000000.000000
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long 10000000026 == float 10000000000.000000
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long 10000000027 == float 10000000000.000000
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long 10000000028 == float 10000000000.000000
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long 10000000029 == float 10000000000.000000
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long 10000000030 == float 10000000000.000000
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long 10000000031 == float 10000000000.000000
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long 10000000032 == float 10000000000.000000
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long 10000000033 == float 10000000000.000000
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long 10000000034 == float 10000000000.000000
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long 10000000035 == float 10000000000.000000
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long 10000000036 == float 10000000000.000000
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long 10000000037 == float 10000000000.000000
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long 10000000038 == float 10000000000.000000
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long 10000000039 == float 10000000000.000000
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long 10000000040 == float 10000000000.000000
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long 10000000041 == float 10000000000.000000
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long 10000000042 == float 10000000000.000000
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long 10000000043 == float 10000000000.000000
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long 10000000044 == float 10000000000.000000
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long 10000000045 == float 10000000000.000000
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long 10000000046 == float 10000000000.000000
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long 10000000047 == float 10000000000.000000
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long 10000000048 == float 10000000000.000000
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long 10000000049 == float 10000000000.000000
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long 10000000050 == float 10000000000.000000
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long 10000000051 == float 10000000000.000000
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long 10000000052 == float 10000000000.000000
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long 10000000053 == float 10000000000.000000
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long 10000000054 == float 10000000000.000000
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long 10000000055 == float 10000000000.000000
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long 1000000001 == double 1000000001.000000
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long 1000000002 == double 1000000002.000000
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long 1000000003 == double 1000000003.000000
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long 1000000004 == double 1000000004.000000
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long 1000000005 == double 1000000005.000000
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long 1000000006 == double 1000000006.000000
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long 1000000007 == double 1000000007.000000
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long 1000000008 == double 1000000008.000000
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long 1000000009 == double 1000000009.000000
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long 1000000010 == double 1000000010.000000
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a 12345.0
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b 1.0E-16
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a + b => 12345.0
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true
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x1 0.3
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x2 0.30000000000000004
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x1 == x2 false
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z1 0.5
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z2 0.5
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z1 == z2 true

‎fromslides/S11-loops-for-dowhile-nested/DSlope.java‎

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package fromslides.S11;
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import java.util.Scanner;
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public class DSlope {
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public static void main(String[] args) {
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int lim = 0;
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// major loop number of rows
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for (int i = 0; i <= 3; i++) {
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// minor loop number of colums
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for (int j = 0; j <= lim; j++) {
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System.out.print("D");
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}
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System.out.println("");
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lim++;
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}
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} //main()
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} //

‎fromslides/S11-loops-for-dowhile-nested/DoWhile.java‎

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package fromslides.S11;
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import java.util.Scanner;
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public class DoWhile {
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public static void main(String[] args) {
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Scanner keyboard = new Scanner(System.in);
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int num; // not initialized
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do
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{
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// do while >= 1 iteration(s)
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// while >= 0 iterations
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System.out.print("Enter an even number: ");
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num = keyboard.nextInt();
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}
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while (num %2 == 1);
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} //main()
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} //

‎fromslides/S11-loops-for-dowhile-nested/For.java‎

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package fromslides.S11;
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import java.util.Scanner;
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public class For {
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public static void main(String[] args) {
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Scanner keyboard = new Scanner(System.in);
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// table of square of numbers 1 to 10
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System.out.println("Number Number Squared");
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System.out.println("-----------------------");
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for (int i = 1; i <= 10; i++) {
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System.out.println(i + "\t\t" + Math.pow(i, 2));
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}
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//equivalent while loop
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int i = 1;
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while (i <= 10) {
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System.out.println(i + "\t\t" + Math.pow(i, 2));
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i++;
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}
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// compound int
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double bal = 1000; // initial balance
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double rate = 0.08; // interest rate
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System.out.println("0 \t" + Math.round(100 * bal) / 100.);
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for (int year = 1; year <= 10; year++) {
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bal = bal + rate * bal;
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//System.out.println(year + " " + Math.round(100 * bal) / 100.);
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System.out.printf("%d \t%.2f\n", year, Math.round(100 * bal) / 100.);
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}
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} //main()
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} //

‎fromslides/S11-loops-for-dowhile-nested/NestedLoops.java‎

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import java.util.Scanner;
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/**
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* This class illustrates exercises from the slide deck for the course
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* nested while loops
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* nested for loops
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*
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* 360-420-DW Intro to Java
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* @author PMCampbell
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* @version today
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**/
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public class NestedLoops {
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public static void main(String[] args) {
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Scanner keyboard = new Scanner(System.in);
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// 24 clock 00:00 to23:59 w minutes
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int minutes, hours = 0;
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while (hours <= 23) {
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minutes = 0;
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while (minutes <= 59) {
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//System.out.println(hours + ":" + minutes);
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System.out.printf("%02d:%02d\n", hours, minutes);
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minutes++;
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}
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hours++;
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}
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// 10x10 table
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final int SIZE = 10;
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int row = 1, col = 1;
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while (row <= SIZE) {
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col = 1;
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while (col <= SIZE) {
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System.out.print(" * ");
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col++;
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}
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System.out.println();
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row++;
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}
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// triangle
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for (int rows = 1; rows <= 5; rows++) {
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for (int cols = 1; cols <= rows; cols++) {
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System.out.print("*");
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}
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System.out.println();
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}
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} //main()
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} //

‎fromslides/S11-loops-for-dowhile-nested/Pi.java‎

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import java.util.Scanner;
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/**
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* This class illustrates exercises from the slide deck for the course
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* Using looping & method calls calcualte PI
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*
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* 360-420-DW Intro to Java
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* @author PMCampbell
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* @version today
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**/
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public class Pi {
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public static void main(String[] args) {
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double pi = calcPi(0.0000001);
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System.out.printf("Estimate of PI is: %.10f\n", pi);
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}
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/**
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* Estimating PI using the Leibniz formula
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*
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* @param accuracy at which to stop estimating
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* @return PI double
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**/
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public static double calcPi(double accuracy) {
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// declare and initialize estimates
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double current = 0;
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double next = 4.0 / 1;
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int n = 1;
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while (Math.abs(next - current) >= accuracy) {
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current = next;
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next = current + 4. * Math.pow(-1, n) / (2 * n + 1);
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n++;
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}
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return current;
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} // main()
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} // Pi

‎fromslides/S11-loops-for-dowhile-nested/Prime.java‎

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import java.util.Scanner;
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/**
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* This class illustrates exercises from the slide deck for the course
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* determine if a number is prime
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*
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* 360-420-DW Intro to Java
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* @author PMCampbell
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* @version today
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**/
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public class Prime {
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public static void main(String[] args) {
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Scanner kb = new Scanner(System.in);
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boolean isPrime = true;
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int count =2, num = 0;
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System.out.println("Enter numbers to test for prime, <= 0 to exit");
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System.out.print("enter an integer: ");
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num = kb.nextInt();
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while (num >= 1 ) {
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count = 2;
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isPrime = true;
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while (count <= Math.sqrt(num) && isPrime) {
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if (num % count==0) {
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isPrime = false;
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}
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count++;
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}
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if (isPrime) {
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System.out.println(num + " is prime");
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} else {
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System.out.println(num + " is NOT prime");
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}
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System.out.print("enter an integer: ");
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num = kb.nextInt();
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}
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} //main()
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} // Prime

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