Golang Example - Program to check Leap year or not

In this blog post, We will write a program to check a given a year  is a leap year or not

Leap year is a year which meets following conditions

1. if the year is divisible by 4, check step 2, else go to step 5
2. if the year is divisible by 100, check step 3 else go to step 4
3. if the year is divisible by 400, check step 4, else go to step 5
4. Then the year is lear year which has 366 days
5. This is not leap year  which has 365 days

Example program  to check given year is a leap year or not

The following features are used in go language

• if else statement
• Golang Operators Guide

Following is example code

package main  
  
import (  
 "fmt"  
)  
  
func isLeapYear(year int) bool {  
 leapFlag := false  
 if year%4 == 0 {  
  if year%100 == 0 {  
   if year%400 == 0 {  
    leapFlag = true  
   } else {  
    leapFlag = false  
   }  
  } else {  
   leapFlag = true  
  }  
 } else {  
  leapFlag = false  
 }  
 return leapFlag  
}  
func main() {  
 bool := isLeapYear(1980)  
 bool1 := isLeapYear(2001)  
 fmt.Println(" 1980 leap year?:", bool)  
 fmt.Println(" 2001 leap year?:", bool1)  
  
}  

Above program is compiled and output is

1980 leap year?: true  
2001 leap year?: false  

In the above program, Created a function isLeapYear which accepts parameter year of type int and returns true if it is a leap year, else false - if not leap year
Since 1980 is divisible by 4 and not divisible 100, so 1980 is a leap year
But 2011 is not divisible by 4, so 2001 is not leap year
Finally ,display the boolean value to console using Println() function