#include <stdio.h>
int main (void)
{
long num;
long sum=0L;
int status;
printf("Please enter an integer to be summed.");
printf("(q to quit): ");
status = scanf("ld",&num);
while (status == 1)
{
sum =sum +num;
printf("Please enter next integer (q to quit):");
status = scanf("%d",&num);
}
printf("Those integer sum to %ld.\n",sum);
return 0;
}

#include <stdio.h>
int main (void)
{
long num=0L;
long sum=0L;
int status=0;
printf("Please enter an integer to be summed.");
printf("(q to quit): ");
scanf("ld",&num);
do
{
sum =sum +num;
printf("Please enter next integer (q to quit):");
status = scanf("%d",&num);
} while (status == 1);
printf("Those integer sum to %ld.\n",sum);
return 0;
}

#include <stdio.h>
int main (void)
{
long num;
long sum=0L;
int status=1;
printf("Please enter an integer to be summed.");
printf("(q to quit): ");
scanf("ld",&num);
while (status == 1)
{
sum =sum +num;
printf("Please enter next integer (q to quit):");
status = scanf("%d",&num);
}
printf("Those integer sum to %ld.\n",sum);
return 0;
}

num符初值为0