This C program reads a sequence of positive integers as input by the user and print their sum. The program keeps on taking the input from user until user enters number ( 0 ) and program calculates the sum of all input numbers. Finally this C program prints the sum of all the numbers on screen and terminates.
This program is an excellent demonstration of using do-while loop of C Programming.
#include <stdio.h>
#define SENTINEL 0
int main(void) {
int sum = 0; // The sum of numbers already read
int current; // The number just read
do {
printf("\nEnter an integer > ");
scanf("%d", ¤t);
if (current > SENTINEL)
sum = sum + current;
}
while (current > SENTINEL);
printf("\nThe sum is %d\n", sum);
}Output of the C Program is:
Enter an integer > 3
Enter an integer > 4
Enter an integer > 6
Enter an integer > 7
Enter an integer > 8
Enter an integer > 45
Enter an integer > 56
Enter an integer > 0
The sum is 129