#include <stdio.h>
#include <stdlib.h>

void main(){
    char x;
    int total = 0;

    while(0==0){
        printf("Input value : ");
        scanf("%s",&x);
        total = total + atoi(&x);
        printf("Total = %d\n",total);
    }

}


=======================


Outputs :


Input value : 4
Total = 4
Input value : 4
Total = 4
Input value : 7
Total = 7
Input value : 17
Total = 72