do while loop in C Programming language

C Programming Language Loop control in C Language (Article) Loop control in C Language (Program)

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Program:

// Program to add numbers until user enters zero

#include <stdio.h>
int main()
{
    double number, sum = 0;

    // loop body is executed at least once
    do
    {
        printf("Enter a number: ");
        scanf("%lf", &number);
        sum += number;
    }
    while(number != 0.0);

    printf("Sum = %.2lf",sum);

    return 0;
}

Output:

Enter a number: 1.5
Enter a number: 2.6
Enter a number: 2.3
Enter a number: 5.6
Enter a number: 1.5
Enter a number: 0
Sum = 13.50

Explanation:

The code block (loop body) inside the braces is executed once.

Then, the test expression is evaluated. If the test expression is true, the loop body is executed again. This process goes on until the test expression is evaluated to 0 (false).

When the test expression is false (nonzero), the do...while loop is terminated.

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