Go - if statement

The if Statement

Go if statement consists of a boolean expression followed by one or more statements. It checks whether the given Boolean expression is true or not. If it is true, the associate statements execute.

Syntax

The syntax of an if statement in Go programming language is −

if(boolean_expression) {
   /* statement(s) will execute if the boolean expression is true */
}

If the boolean expression evaluates to true, then the block of code inside the if statement is executed. If boolean expression evaluates to false, then the first set of code after the end of the if statement (after the closing curly brace) is executed.

Flow Diagram

Example

This example demonstrates how to use an if statement in Go to check a condition and execute a block of code when the condition is true.

package main

import "fmt"

func main() {
   /* local variable definition */
   var a int = 10
 
   /* check the boolean condition using if statement */
   if( a < 20 ) {
      /* if condition is true then print the following */
      fmt.Printf("a is less than 20\n" )
   }
   fmt.Printf("value of a is : %d\n", a)
}

When the above code is compiled and executed, it produces the following result −

a is less than 20;
value of a is : 10

Example

In the following example, we are checking if a number is positive, negative, or zero using only if statements:

package main

import "fmt"

func main() {
    var num int
    
    num = -10

    if num > 0 {
        fmt.Println("The number is positive.")
    }
    if num < 0 {
        fmt.Println("The number is negative.")
    }
    if num == 0 {
        fmt.Println("The number is zero.")
    }
}

When the above code is compiled and executed, it produces the following result −

The number is negative.