C# Program to Check Leap Year
A leap year is a calendar year in which an additional day is added to February month. In a leap year, the number of days in February month and the year are 29 and 366 respectively. A year that is not a leap year is called a common year. A year is said to be a leap year if:
- it is divisible by 4.
- it is divisible by 4 but not divisible by 100.
- it is divisible by 4, 100 and 400.
Method 1: Using conditional statements
In the below example, conditional statements are used to identify a leap year.
using System;
class MyProgram {
static void Main(string[] args) {
int year = 2019;
if (year % 400 == 0) {
Console.Write(year + " is a leap year.");
} else if (year % 100 == 0) {
Console.Write(year + " is not a leap year.");
} else if (year % 4 == 0) {
Console.Write(year + " is a leap year.");
} else {
Console.Write(year + " is not a leap year.");
}
}
}
The above code will give the following output:
2019 is not a leap year.
Method 2: Using function
In the below example, a function called leapyear() is created which takes year as argument and prints whether the passed year is a leap year or not.
using System;
class MyProgram {
static void leapyear(int year)
{
if (year % 400 == 0) {
Console.Write(year + " is a leap year.");
} else if (year % 100 == 0) {
Console.Write(year + " is not a leap year.");
} else if (year % 4 == 0) {
Console.Write(year + " is a leap year.");
} else {
Console.Write(year + " is not a leap year.");
}
}
static void Main(string[] args) {
leapyear(2019);
}
}
The above code will give the following output:
2019 is not a leap year.
