How to use sum control statements in c language

#include <stdio.h>
  int main()
  {
    int num, sum = 0;
    do
    {
        printf("Enter a number (enter 0 to stop) : ");
        scanf("%d", &num);
        sum += num;
    } while (num != 0);
    printf("sum is %d\n", sum);
    return 0;
  }
  

  Enter a number (enter 0 to stop) : 1
    Enter a number (enter 0 to stop) : 4
    Enter a number (enter 0 to stop) : 5
    Enter a number (enter 0 to stop) : 7
    Enter a number (enter 0 to stop) : 8
    Enter a number (enter 0 to stop) : 0
    sum is 25