Python Programing Lab EXERCISE - 3(d)

Aim: 
             Write a program using a while loop that asks the user for a number, and prints a countdown from that number to zero.

Description: 
                       A loop statement allows us to execute a statement or group of statements multiple times. Here, We are using while loop.
while loop statement: It repeatedly executes a target statement as long as the given condition is true. The general form while statement is as follows: 

                                           while expression: 
                                            statements(s) 

                Here, the statement(s) may be a single a statement or a block of statements. The condition may be any expression, and is true for any non-zero value. The loop iterates while the condition is true. When the condition becomes false, program control passes to the line immediately following the loop.

Algorithm:

Input: A Number

Output: Print the values from given number to zero 
Step1: Start 
Step2: Read num 
Step3: Repeat Steps 4 and 5 while num>=0 
Step4: Display num 
Step5: Decrement num by 1 
Step6: Stop

Program:

num=int(input("Enter number:"))
print("Countdown Starts:")
while(num>=0):
      print(num)
      num=num-1

Output:


Conclusion: I gets the knowledge on conditional statements and looping statements. 

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