我正在从一本书中学习C,我开始使用循环指令。 但是有一个我无法理解的示例代码。
任何人都可以告诉我为什么作者使用status = scanf("%ld", &num);
? 为什么有一个=
with scanf
?
/* summing.c -- sums integers entered interactively */
#include <stdio.h>
int main(void)
{
long num;
long sum = 0L; /* initialize sum to zero */
int status;
printf("Please enter an integer to be summed ");
printf("(q to quit): ");
status = scanf("%ld", &num);
while (status == 1) /* == means "is equal to" */
{
sum = sum + num;
printf("Please enter next integer (q to quit): ");
status = scanf("%ld", &num);
}
printf("Those integers sum to %ld.\n", sum);
return 0;
}