<C Primer Plus>5 Looping while

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

    printf("Please input an integer to be summed.");
    printf("(q to quit): ");
    status = scanf("%ld", &num);
    while (status == 1){
        sum = sum + num;
        printf("Pleast enter next integer (q to quit):");
        status = scanf("%ld", &num);
    }
    printf("Those integers sum to %ld.
", sum);

    return 0;
}
The pseudocode:

　　initialize sum to 0
　　prompt user
　　read input
　　while the input is an integer
　　　　　　add the input to sum
　　　　　　promt user
　　　　　　then read the next input

　　after input completes ,print sum

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

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

    return 0;
}

The pseudocode :
while getting and testing the value succeeds
　　process the value

 REMEBER:

A for loop is appropriate when the loop involves initializing and updating a variable, and a while loop is better when the conditions are othervise.

for example:

while (scanf("%ld",&num) == 1)

for(count = 1;count <= 100; count++)