Question

Write a program that reads numbers from scanf (keyboard) and then sums them, stopping when 0 has been entered. Construct three versions of this program, using the while, do-while, and forloops.

Answer 1

Answer:

For loop Version:

#include <stdio.h>

int main()

{

   int number, sum = 0;

   printf("Enter a positive integer: ");

   scanf("%d", &number);

   

   for (int i = 0; i <= number; i++) {

       if(number == 0)

           break;

       sum += number;

       

       printf("Enter a positive integer: ");

       scanf("%d", &number);

   }

   printf("Sum is: %d", sum);

   return 0;

}

- - - - -

While Loop Version:

#include <stdio.h>

int main()

{

   int number, sum = 0, i = 0;

   printf("Enter a positive integer: ");

   scanf("%d", &number);

   

   while (number != 0) {

       sum += number;

       

       printf("Enter a positive integer: ");

       scanf("%d", &number);

   }

   printf("Sum is: %d", sum);

   return 0;

}

Do-while Loop Version:

#include <stdio.h>

int main()

{

   int number, sum = 0, i = 0;

   

   do {

       printf("Enter a positive integer: ");

       scanf("%d", &number);

       

       sum += number;

       

   } while (number != 0);

   printf("Sum is: %d", sum);

   return 0;

}

Explanation:

- Initialize the variables

- Ask the user for the numbers until the user enters 0

-  Calculate and print the sum