OneCompiler

If Else Statements in Go Programming Language

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If Statement

If statement is used to execute a block of code when the specified condition evaluates to true.

Syntax

if condition{
//executable statemnets
}

Example

package main
import "fmt"

func main() {
	age:=18		
    if age >= 17 && age <= 30 {
	fmt.Println("My SecondAge is between 17 and 30")
    }
}

You can run this program live here https://onecompiler.com/go/3usgmwf33

Output

My Age is between 17 and 30

If-else Statement

If-else Statement allows you to execute block of code if the condition evaluates to true and another block will execute if it is evaluates to false.

Syntax

if condition{
   //code needs to be executed if it is True
}else{
   //code needs to be executed if it is false
}

Example

package main
 
import (
	"fmt"
)
 
func main() {
	number := 10
 
	if number%2 == 0 {
		fmt.Println(number,":is an even number")
	} else {
		fmt.Println(number," :is an odd number")
	}
}

You can run this program live here https://onecompiler.com/go/3ut3r69dg

Output

10 : is an even number

If...else if...else Statement

If allows us to combine multiple if...else statements.

Syntax

if  condition-1 { 
    // code needs to be executed if condition-1 is true
} else if condition-2 {
    // code needs to be executed if condition-2 is true
} else {
    // code needs to be executed if both condition1 and condition2 are false
}

Example

package main
 
import ("fmt")
 
func main() {
	var BMI = 21.0
	if BMI < 18.5 {
		fmt.Println("You are underweight");
	} else if BMI >= 18.5 && BMI < 25.0 {
		fmt.Println("Your weight is normal");
	} else if BMI >= 25.0 && BMI < 30.0 {
		fmt.Println("You're overweight")
	} else {
		fmt.Println("You're obese")
	}
}

You can run this program live here https://onecompiler.com/go/3ut3ygzs2

Output

Your weight is normal

Initialization in If-Statement

In Golang If-Statement supports composite syntax where condition precedes initialization.

Syntax

if vardeclaration; condition{
//code needs to be executed if condition is True
}

Example

package main
import "fmt"

func main() {
	
	if  number := 10 ; number%2 == 0{
	  fmt.Println(number,": is even")
	}else{
	  fmt.Println(number,": is Odd")
	}
}

You can run this program live here https://onecompiler.com/go/3ut3z4f86

Output

10 : is even