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code for arry slide deck
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‎.gitignore‎

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*.log
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*~
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*.swp
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fromslides/S12*
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fromslides/S13*
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fromslides/S14*
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fromslides/S14*

‎fromslides/S12-Arrays/Array1.java‎

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//package fromslides.S12;
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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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* 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 Array1 {
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public static void main(String[] args) {
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// declare int variables (memory reserved for each)
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int num1, num2, num3;
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int sum, mult;
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// declare int array variable (memory reserved for the address of the array)
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int num[];
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// instantiate the array (reserve heap memory for it)
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num = new int[3];
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// assign integer literals to int variables
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num1 = 5;
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num2 = 10;
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num3 = 15;
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// use int variables
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sum = num1 + num2 + num3;
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mult = num1 * num2 * num3;
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System.out.printf("The sum of %d + %d + %d is %d\n",
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num1, num2, num3, sum);
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System.out.printf("The product of %d * %d * %d is %d\n",
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num1, num2, num3, mult);
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// assign integer literals to int array elements
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num[0] = 5;
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num[1] = 10;
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num[2] = 15;
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// use int variables
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sum = num[0] + num[1] + num[2];
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mult = num[0] * num[1] * num[2];
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System.out.printf("The sum of %d + %d + %d is %d\n",
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num[0], num[1], num[2], sum);
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System.out.printf("The product of %d * %d * %d is %d\n",
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num[0], num[1], num[2], mult);
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} //main()
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} //

‎fromslides/S12-Arrays/Array2.java‎

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package fromslides.S13;
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import java.util.Scanner;
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public class Array2 {
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public static void main(String[] args) {
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// declare and instantiate
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// declare = (memory reserved for the address of the array)
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// instantiate = (memory reserved for the elements in the array)
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int daysInMonth[] = {31, 28,31,30,31,30,31,31,30,31,30,31};
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int months[] = {1,2,3,4,5,6,7,8,9,10,11,12};
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String monthsString[] = { "Jan", "Feb", "Mar", "Apr", "May",
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"Jun", "Jul", "Aug", "Sep", "Oct",
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"Nov", "Dec"};
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int month;
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Scanner kb = new Scanner(System.in);
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System.out.print("Enter a month: ");
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month = (kb.nextInt() - 1);
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System.out.printf("%s has %d days\n", monthsString[month], daysInMonth[month]);
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} //main()
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} //

‎fromslides/S12-Arrays/ArrayCopy.java‎

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package fromslides.S13;
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import java.util.Scanner;
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public class ArrayCopy {
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public static void main(String[] args) {
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int array[] = { 2, 4, 6, 8, 10 };
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int array2[];
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// shallow copy, both arrays refer to the same area in heap
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array2 = array;
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System.out.println("shallow copied array:");
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System.out.println("array[2] contains " + array[2]);
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System.out.println("array2[2] contains " + array2[2]);
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array[2] = 99;
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array2[2] = 5;
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System.out.println("after mod array[2] = 99 and array2[2] = 5");
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System.out.println("array[2] contains " + array[2]);
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System.out.println("array2[2] contains " + array2[2]);
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// deep copy, different area in heap for each array
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System.out.println("deep copied array:");
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array2 = new int[5];
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for (int i = 0; i < 5; i++) {
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array2[i] = array[i];
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}
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System.out.println("array[2] contains " + array[2]);
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System.out.println("array2[2] contains " + array2[2]);
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array[2] = 99;
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array2[2] = 15;
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System.out.println("after mod array[2] = 99 and array2[2] = 15");
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System.out.println("array[2] contains " + array[2]);
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System.out.println("array2[2] contains " + array2[2]);
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} //main()
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} // ArraySize

‎fromslides/S12-Arrays/ArraySize.java‎

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package fromslides.S13;
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import java.util.Scanner;
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public class ArraySize {
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public static void main(String[] args) {
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// declare and instantiate
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// declare = (memory reserved for the address of the array)
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// instantiate = (memory reserved for the elements in the array)
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int numTests, tests[], sum=0, count;
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Scanner kb = new Scanner(System.in);
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System.out.print("How Many Tests? ");
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numTests = kb.nextInt();
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tests = new int[numTests];
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count = 0;
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while (count < tests.length) {
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System.out.printf("Mark for test #%d: ", count+1);
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tests[count] = kb.nextInt();
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count++;
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}
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for (int i=0; i < tests.length; i++) {
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sum += tests[i];
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}
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System.out.printf("Average %d of %d tests\n",
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sum/tests.length, tests.length);
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} //main()
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} // ArraySize

‎fromslides/S12-Arrays/Numbers.java‎

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// remove line or change packageName to reflect your directory structure
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//package packageName;
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// needed if using Scanner
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import java.util.Scanner;
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/**
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* read in 5 numbers give the sum/ average
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* @author P.M.Campbell
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* @version today
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**/
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public class Numbers
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{
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public static void main(String[] args)
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{
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int num1, num2,num3,num4, num5;
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Scanner kb = new Scanner(System.in);
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// read in 5 numbers
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// for ( init ; condition ; change cond )
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// for (int i=0; i < 5 ; i++) {
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System.out.println("Enter 5 numbers:");
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num1 = kb.nextInt();
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num2 = kb.nextInt();
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num3 = kb.nextInt();
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num4 = kb.nextInt();
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num5 = kb.nextInt();
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// average & sum
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System.out.println("Average "+
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(num1+num2+num3+num4+num5)/5);
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System.out.println("Sum "+
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(num1+num2+num3+num4+num5) );
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} // main()
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} // Numbers class

‎fromslides/S12-Arrays/NumbersArray.java‎

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// remove line or change packageName to reflect your directory structure
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//package packageName;
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// needed if using Scanner
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import java.util.Scanner;
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/**
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* read in 5 numbers give the sum/ average
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* using an array
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* @author P.M.Campbell
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* @version today
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**/
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// reference == pointer == address
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public class NumbersArray
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{
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public static void main(String[] args)
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{
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//int num1, num2,num3,num4, num5;
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final int ARRAY_SIZE = 3;
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int num[]; // declare array (pointer in stack)
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int average=0, sum=0;
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Scanner kb = new Scanner(System.in);
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num = new int[ARRAY_SIZE]; // instantiate array (space in heap)
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// read in 5 numbers
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// for ( init ; condition ; change cond )
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for (int i=0; i < ARRAY_SIZE ; i++) {
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System.out.println("Enter a number:");
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num[i] = kb.nextInt();
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System.out.println("DEBUG: i: "+i +
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" num[i] " + num[i] );
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}
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// average & sum
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for (int i=0; i < ARRAY_SIZE ; i++) {
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sum += num[i];
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}
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average = sum/ARRAY_SIZE;
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System.out.println("Average "+average);
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System.out.println("Sum "+sum);
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} // main()
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} // Numbers class

‎fromslides/S12-Arrays/NumbersArrayUserCount.java‎

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// remove line or change packageName to reflect your directory structure
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//package packageName;
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// needed if using Scanner
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import java.util.Scanner;
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/**
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* read in 5 numbers give the sum/ average
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* using an array
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* @author P.M.Campbell
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* @version today
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**/
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// reference == pointer == address
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public class NumbersArrayUserCount
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{
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public static void main(String[] args)
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{
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//int num1, num2,num3,num4, num5;
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final int ARRAY_SIZE = 3;
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int entries;
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int num[]; // declare array (pointer in stack)
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int average=0, sum=0;
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Scanner kb = new Scanner(System.in);
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System.out.print("How many numbers do you want to sum today? ");
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entries = kb.nextInt();
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num = new int[entries]; // instantiate array (space in heap)
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// read in 5 numbers
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// for ( init ; condition ; change cond )
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for (int i=0; i < entries ; i++) {
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System.out.println("Enter a number:");
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num[i] = kb.nextInt();
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System.out.println("DEBUG: i: "+i +
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" num[i] " + num[i] );
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}
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// average & sum
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for (int i=0; i < entries ; i++) {
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sum += num[i];
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}
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average = sum/entries;
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System.out.println("Average "+average);
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System.out.println("Sum "+sum);
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} // main()
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} // Numbers class

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