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闰年是能被4整除的年份，但世纪年（以00结尾的年份）除外。世纪年只有能被400整除时才是闰年。
例如，
- 1999年不是闰年
- 2000年是闰年
- 2004年是闰年
检查闰年的程序
#include <stdio.h>
int main() {
int year;
printf("Enter a year: ");
scanf("%d", &year);
// leap year if perfectly divisible by 400
if (year % 400 == 0) {
printf("%d is a leap year.", year);
}
// not a leap year if divisible by 100
// but not divisible by 400
else if (year % 100 == 0) {
printf("%d is not a leap year.", year);
}
// leap year if not divisible by 100
// but divisible by 4
else if (year % 4 == 0) {
printf("%d is a leap year.", year);
}
// all other years are not leap years
else {
printf("%d is not a leap year.", year);
}
return 0;
}输出 1
Enter a year: 1900 1900 is not a leap year.
输出 2
Enter a year: 2012 2012 is a leap year.