While loop. "Summing integers" interactive program

output.txt

Please enter an integer to be summed (q to quit): 39
Please enter next integer (q to quit): 13
Please enter next integer (q to quit): 88
Please enter next integer (q to quit): q
________________________________________
Those integers sum to 140.

Program ended with exit code: 0

summing.c

#include <stdio.h>
int main(void)
{
    long num;
    long sum = 0L;

    printf("Please enter an integer to be summed (q to quit): ");
    while (scanf("%ld", &num) == 1)
    {
        sum = sum + num;
        printf("Please enter next integer (q to quit): ");
    }
    printf("________________________________________\nThose integers sum to %ld.\n\n", sum);

    return 0;
}

This program was created based on the listing 6.1 from C Primer Plus (6th Edition) by Prata, Stephen.