main.go

package main

import "fmt"

// Q1. Write a function that takes in a number and
// returns the next number that is divisible by 7.
func next7(n int) int {
	n++
	if n%7 == 0 {
		return n
	}
	return next7(n)
}

// Q2. Write a function that takes in two numbers
// and returns their greatest common divisor.
func gcd(a, b int) int {
	if b == 0 {
		return a
	}
	return gdc(b, a%b)
}

func main() {
	fmt.Println("next multiple of seven after i:")
	for i := 0; i < 20; i++ {
		fmt.Printf("%v: %v\n", i, next7(i))
	}
	fmt.Println()
	fmt.Println("Greatest common divisor of a,b:")
	for i := -10; i < 10; i++ {
		for j := -10; j < 10; j++ {
			fmt.Printf("%v, %v: %v\n", i, j, gcd(i, j))
		}
	}
}