Go Program to find the Perfect Number

A number can be a Perfect number if the sum of positive divisors excluding the number itself equals a given number. For instance 6 is a perfect number (Sum of 6 Divisors are: 1 + 2 + 3 = 6). 

This Go program to find the Perfect Number uses for loop (for i := 1; i < perfNum; i++) and If statement (if perfNum%i == 0) to find the sum of the given number’s positive divisors. After the for loop, we used the If else statement (if perfNum == perfsum) to check whether the divisors’ sum equaled to a given number. If True, it is a perfect number; otherwise, not perfect.

package main

import "fmt"

func main() {

    var perfNum, perfsum int
    perfsum = 0

    fmt.Print("Enter the Number to find the Perfect = ")
    fmt.Scanln(&perfNum)

    for i := 1; i < perfNum; i++ {
        if perfNum%i == 0 {
            perfsum = perfsum + i
        }
    }

    if perfNum == perfsum {
        fmt.Println(perfNum, " is a Perfect Number")
    } else {
        fmt.Println(perfNum, " is Not a Perfect Number")
    }
}

SureshMac:Goexamples suresh$ go run perfect1.go
Enter the Number to find the Perfect = 6
6  is a Perfect Number
SureshMac:Goexamples suresh$ go run perfect1.go
Enter the Number to find the Perfect = 22
22  is Not a Perfect Number

Go Program to find the Number is Perfect using Functions

package main

import "fmt"

var perfsum int = 0

func perfectNum(perfNum int) int {
    for i := 1; i < perfNum; i++ {
        if perfNum%i == 0 {
            perfsum = perfsum + i
        }
    }
    return perfsum
}
func main() {

    var perfNum int

    fmt.Print("Enter the Number to find the Perfect = ")
    fmt.Scanln(&perfNum)

    perfsum = perfectNum(perfNum)

    if perfNum == perfsum {
        fmt.Println(perfNum, " is a Perfect Number")
    } else {
        fmt.Println(perfNum, " is Not a Perfect Number")
    }
}

SureshMac:Goexamples suresh$ go run perfect2.go
Enter the Number to find the Perfect = 28
28  is a Perfect Number
SureshMac:Goexamples suresh$ go run perfect2.go
Enter the Number to find the Perfect = 250
250  is Not a Perfect Number

This Golang program will find and print the Perfect numbers between the minimum and maximum limit.

package main

import "fmt"

func main() {

    var perfNum, perfMin, perfMax, perfsum int
    perfsum = 0

    fmt.Print("Enter the Minimum and Maximum limit of Perfect Numbers = ")
    fmt.Scanln(&perfMin, &perfMax)

    for perfNum = perfMin; perfNum <= perfMax; perfNum++ {
        perfsum = 0
        for i := 1; i < perfNum; i++ {
            if perfNum%i == 0 {
                perfsum = perfsum + i
            }
        }
        if perfNum == perfsum {
            fmt.Print(perfNum, "\t")
        }
    }
}