摘要：
#include <stdio.h> long get_long(void); int main(void) { long num; printf("please input an num: "); num = get_long(); printf("num: %ld.\n", num); retu 阅读全文
摘要：
#include <stdio.h> int main(void) { long num; printf("please input an positive num: "); while(1) { while(scanf("%ld", &num) != 1) { printf("please inp 阅读全文