Tutorial

Loops

Go has only one looping construct, the for loop.

The basic for loop has three components separated by semicolons:

• the init statement: executed before the first iteration
• the condition expression: evaluated before every iteration
• the post statement: executed at the end of every iteration

The init statement will often be a short variable declaration, and the variables declared there are visible only in the scope of the for statement.

The loop will stop iterating once the boolean condition evaluates to false.

Note: Unlike other languages like C, Java, or JavaScript there are no parentheses surrounding the three components of the for statement and the braces { } are always required

Examples

package main

import "fmt"

func main() {
	for i := 0; i < 10; i++ {
		fmt.Println(i)
	}
}

Exercise

Find the sum of numbers from 1 to 100

Tutorial Code

package main

import "fmt"

func main() {
	sum := 0

	// write code here

	fmt.Println(sum)
}

Expected Output

5050

Show Solution

package main

import "fmt"

func main() {
sum := 0
for i := 1; i <= 100; i++ {
sum += i
}
fmt.Println(sum)
}