Go Program to find Sum of Even Numbers

Write a Go program to find Sum of Even Numbers from 1 to n. It uses the for loop to iterate between 1 and n. Inside the loop, if statement filters the even numbers and adds total even to total.

package main

import "fmt"

func main() {

    var evnum, eventotal int

    fmt.Print("Enter the Number to find Even Sum = ")
    fmt.Scanln(&evnum)

    eventotal = 0
    fmt.Println("List of Even Numbers from 1 to ", evnum, " are = ")
    for x := 1; x <= evnum; x++ {
        if x%2 == 0 {
            fmt.Print(x, "\t")
            eventotal = eventotal + x
        }
    }
    fmt.Println("\nSum of Even Numbers from 1 to ", evnum, " = ", eventotal)
}

Enter the Number to find Even Sum = 10
List of Even Numbers from 1 to  10  are = 
2       4       6       8       10
Sum of Even Numbers from 1 to  10  =  30

Golang Program to find Sum of Even Numbers

In this Golang program, we altered the for loop and calculating the sum of even numbers.

package main

import "fmt"

func main() {

    var evnum, eventotal int

    fmt.Print("Enter the Number to find Even Sum = ")
    fmt.Scanln(&evnum)

    eventotal = 0
    fmt.Println("List of Even Numbers from 1 to ", evnum, " are = ")
    for x := 2; x <= evnum; x = x + 2 {
        fmt.Print(x, "\t")
        eventotal = eventotal + x
    }
    fmt.Println("\nSum of Even Numbers from 1 to ", evnum, " = ", eventotal)
}

Enter the Number to find Even Sum = 20
List of Even Numbers from 1 to  20  are = 
2       4       6       8       10      12      14      16      18      20
Sum of Even Numbers from 1 to  20  =  110

This Go program calculates the sum of even numbers from minimum to maximum. Here, we used an extra if statement to ensure that the user entered value is an even number by incrementing the odd values.

package main

import "fmt"

func main() {

    var evenmin, evenmax, eventotal int

    fmt.Print("Enter the Minimum Even Number = ")
    fmt.Scanln(&evenmin)
    fmt.Print("Enter the Maximum Even Number = ")
    fmt.Scanln(&evenmax)

    if evenmin%2 != 0 {
        evenmin++
    }

    eventotal = 0
    fmt.Println("Even Numbers from ", evenmin, " to ", evenmax, " = ")
    for x := evenmin; x <= evenmax; x = x + 2 {
        fmt.Print(x, "\t")
        eventotal = eventotal + x
    }
    fmt.Println("\nSum of Even Numbers from ", evenmin, " to ", evenmax, " = ", eventotal)
}

Enter the Minimum Even Number = 30
Enter the Maximum Even Number = 50
Even Numbers from  30  to  50  = 
30      32      34      36      38      40      42      44      46      48      50
Sum of Even Numbers from  30  to  50  =  440

It is the same as the first Sum of Even Numbers example. However, this go example calculates the sum between the min and max limit.

package main

import "fmt"

func main() {

    var evenmin, evenmax, eventotal int

    fmt.Print("Enter the Minimum Even Number = ")
    fmt.Scanln(&evenmin)
    fmt.Print("Enter the Maximum Even Number = ")
    fmt.Scanln(&evenmax)

    eventotal = 0
    fmt.Println("Even Numbers from ", evenmin, " to ", evenmax, " = ")
    for x := evenmin; x <= evenmax; x++ {
        if x%2 == 0 {
            fmt.Print(x, "\t")
            eventotal = eventotal + x
        }
    }
    fmt.Println("\nSum of Even Numbers from ", evenmin, " to ", evenmax, " = ", eventotal)
}