1. 分别获得一个四位数的个、十、百、千位上的数字

#include <stdio.h>int main(void)
{int num = 1234;int ge = 0;int shi = 0;int bai = 0;int qian = 0;ge = num % 10;shi = num / 10 % 10;bai = num / 100 % 10;qian = num / 1000;printf("ge = %d\n", ge);printf("shi = %d\n", shi);printf("bai = %d\n", bai);printf("qian = %d\n", qian);return 0;
}

2. 判断闰年

#include <stdio.h>int main(void)
{int year = 0;scanf("%d", &year);if (0 == year % 4 && 0 != year % 100 || 0 == year % 400){printf("leapyear!\n");}else {printf("not leapyear!\n");}return 0;
}

3. 打印水仙花数

#include <stdio.h>int main(void)
{int num = 0;int ge = 0;int shi = 0;int bai = 0;for (num = 100; num < 1000; num++){ge = num % 10;shi = num / 10 % 10;bai = num / 100;if (ge * ge * ge + shi * shi * shi + bai * bai * bai == num){printf("%d\n", num);}}return 0;
}