If else in Go

In Go, the if statement is used to execute a block of code if a condition is true. If the condition is false, the code block is skipped.

Code

package main
 
import "fmt"
 
func main() {
	//  if else statement
	fmt.Println("Enter a number: ")
	var num int
	fmt.Scanln(&num)
	if num >=18 {
		fmt.Println("You are eligible to vote")
	} else {
		fmt.Println("You are not eligible to vote")
	}
 
	//  this is a short statement
	if age:=18; age<60 {
		fmt.Println("You are in the working age group")
	} else {
		fmt.Println("You are not in the working age group")
	}
	// this is a short statement
	if num:=10; num%2==0 {
		fmt.Println("Even number")
	} else {
		fmt.Println("Odd number")
	}
}

Output

Enter a number:
20
You are eligible to vote
You are in the working age group
Even number

Explanation

If-Else Statement

fmt.Println("Enter a number: ")
var num int
fmt.Scanln(&num)
if num >= 18 {
    fmt.Println("You are eligible to vote")
} else {
    fmt.Println("You are not eligible to vote")
}

Prompts the user to enter a number and reads it into the variable num.
Checks if the entered number is greater than or equal to 18.
Prints You are eligible to vote if the condition is true; otherwise, prints You are not eligible to vote.

If Statement with a Short Variable Declaration

if age := 18; age < 60 {
fmt.Println("You are in the working age group")
} else {
fmt.Println("You are not in the working age group")
}

Declares and initializes age to 18 within the if statement.
Checks if age is less than 60.
Prints You are in the working age group if true; otherwise, prints You are not in the working age group.
If Statement with a Short Variable Declaration and Modulo Operation:

if num := 10; num%2 == 0 {
fmt.Println("Even number")
} else {
fmt.Println("Odd number")
}

Declares and initializes num to 10 within the if statement.
Checks if num is even by evaluating the condition num % 2 == 0.
Prints Even number if true; otherwise, prints Odd number.

04. For Loop 06. Arrays