New Excercises (#30)

georgerahul24 · web-flow · commit 18c7cea0c475 · 2021-07-30T22:33:54.000+03:00
diff --git a/LICENSE b/LICENSE
@@ -1,7 +1,7 @@
 The instructions and text in this tutorial (the "software") are licensed
 under the zlib License.
 
-      (C) 2016-2018 Akuli
+      (C) 2016-2021 Akuli
 
       This software is provided 'as-is', without any express or implied
       warranty.  In no event will the authors be held liable for any damages
diff --git a/basics/answers.md b/basics/answers.md
@@ -92,7 +92,7 @@ isn't exactly like mine but it works just fine it's ok, and you can
         print("Access denied.")
     ```
 
-    Again, this is not a good way to ask a real password from the user.
+    Again, this is not a good way to ask a real password from the user. 
 
 ## Handy stuff: Strings
 
@@ -156,7 +156,15 @@ isn't exactly like mine but it works just fine it's ok, and you can
     print(message, "!!!")
     print(message, "!!!")
     ```
-
+3. In the code below, `palindrome_input[::-1]` is the string `palindrome_input` reversed.
+   For example, if `palindrome_input` is `"hello"`, then `palindrome_input[::-1]` is `"olleh"`.
+   ```python
+   palindrome_input=input("Type the number to check:") 
+   if palindrome_input == palindrome_input[::-1]:
+       print("This string is a palindrome")
+   else:
+       print("This string is not a palindrome")
+   ```
 ## Lists and tuples
 
 1.  Look carefully. The `namelist` is written in `()` instead of `[]`,
@@ -296,6 +304,36 @@ isn't exactly like mine but it works just fine it's ok, and you can
     print(converted_numbers)
     ```
 
+5. ``` python
+   row_count = int(input("Type the number of rows needed:")) 
+   for column_count in range(1, row_count+1):
+       # Print numbers from 1 to column_count
+       for number in range(1, column_count+1): 
+           print(number, end=" ") 
+       print()  # creates a new line for the next row
+   ```
+   If the user enters 5, we want to do a row with 1 column, then 2 columns, and so on until 5 columns.
+   That would be `for column_count in range(1, 6)`, because the end of the range is excluded.
+   In general, we need to specify `row_count + 1` so that it actually ends at  `row_count`.
+   The second loop is similar.
+
+   Usually `print(number)` puts a newline character at the end of the line, so that the next print goes to the next line.
+   To get all numbers on the same line, we use a space instead of a newline character,
+   but we still need `print()` to add a newline character once we have printed the entire row.
+
+   
+  
+6. ```python
+   row_count=int(input("Type the number of rows needed:"))
+    
+   for line_number in range(1, row_count + 1):
+     for number in range(line_number, row_count+1):
+        print(number, end=' ')
+     print()
+   ```
+   Just like in the previous exercise, if the user enters 5, the first `for` loop gives the line numbers `1, 2, 3, 4, 5`.<br>
+   For example, on line 2, we should print numbers from 2 to 5, as in `range(2, 6)`, or in general, `range(line_number, row_count+1)`.
+
 ## Trey Hunner: zip and enumerate
 
 1. Read some lines with `input` into a list and then enumerate it.
diff --git a/basics/handy-stuff-strings.md b/basics/handy-stuff-strings.md
@@ -424,6 +424,8 @@ ValueError: could not convert string to float: 'hello'
     print(message, "!!!")
     print(message, "!!!")
     ```
+3. Make a program to take the input from the user and check if it is a palindrome.<br>
+   (Hint: A string is a palindrome if it is the same when reversed. Google how to reverse a string.)
 
 The answers are [here](answers.md#handy-stuff-strings).
 
diff --git a/basics/if.md b/basics/if.md
@@ -312,6 +312,7 @@ you are asked to "fix code", feel free to add missing blank lines.
     the user entered the correct password, a wrong password, or nothing
     at all by pressing Enter without typing anything.
 
+
 The answers are [here](answers.md#if-else-and-elif).
 
 ***
diff --git a/basics/loops.md b/basics/loops.md
@@ -470,7 +470,25 @@ while True:
         number = int(number)
     print(numbers)
     ```
-
+5. Make a program that prints a pyramid like shown below. Ask the user to type the number of rows needed.
+   ```
+   OUTPUT for 5 rows
+   1 
+   1 2 
+   1 2 3 
+   1 2 3 4 
+   1 2 3 4 5 
+   ```
+
+6. Make a program to get a pyramid like shown below where user can type the number of rows needed.
+   ```
+   OUTPUT for 5 rows
+   1 2 3 4 5 
+   2 3 4 5 
+   3 4 5 
+   4 5 
+   5 
+   ```
 The answers are [here](answers.md#loops).
 
 ***
