// 0006.go contains some functions to solve ProjectEuler.net's Problem #6
// https://projecteuler.net/problem=6
package main

import "fmt"

// SumOfSquares calculates the sum of the squares of all natural numbers 
// up to the given maxNumber.
func SumOfSquares(maxNum int) int {
	// Initialise the sum of squares variable
	sum := 0

	// Add squares of natural numbers
	for i := 1; i <= maxNum; i++ {
		sum += i*i
	}

	// Return answer
	return sum
}

// SquareOfSum squares the sum of all natural numbers up to the given
// maxNumber.
func SquareOfSum(maxNum int) int {
	// Initialise the sum of all numbers variable
	sum := 0

	// Add natural numbers of variable
	for i := 1; i <= maxNum; i++ {
		sum += i
	}

	// Square sum and return answer
	return sum*sum
}

func main(){
	// Answer the problem
	fmt.Println(SquareOfSum(100)-SumOfSquares(100))
}