In this example, you will learn to check whether the year
entered by the user is a leap year or not.

To
understand this example, you should have the knowledge of the following C
programming topics:

C Programming Operators

C if...else Statement

A
leap year is exactly divisible by 4 except for century years (years ending with
00). The century year is a leap year only if it is perfectly divisible by 400.

For
example,

·
1999 is not a leap year

·
2000 is a leap year

·
2004 is a leap year

Program to Check Leap Year

```
#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;
}
```

**Output 1**

Enter a year: 1900

1900 is not a leap year.

**Output 2**

Enter a year: 2012

2012 is a leap year.

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