public/subjects/addlinkednumbers.en.md

addlinkednumbers

WARNING! VERY IMPORTANT!

For this exercise a function will be tested with the exam own main. However the student still needs to submit a structured program:

This means that:

• The package needs to be named package main.
• The submitted code needs one declared function main(func main()) even if empty.
• The function main declared needs to also pass the Restrictions Checker(illegal functions tester). It is advised for the student to just empty the function main after its own testing are done.
• Every other rules are obviously the same than for a program.

Instructions

You have two numbers represented by a linked list, where each NodeAddL contains a single digit. The digits are stored in reverse order, such that the 1’s digit is at the head of the list. Write a function that adds the two numbers and returns the sum as a linked list

Expected function and structure

package main

type NodeAddL struct {
	Next *NodeAddL
	Num  int
}

func AddLinkedNumbers(num1, num1 *NodeAddL) *NodeAddL {

}

Usage

Here is a possible program to test your function:

package main

import (
    "fmt"
)

func pushFront(node *NodeAddL, num int) *NodeAddL {
	// ...
	// Write yourself
}

func main() {
	// 3 -> 1 -> 5
	num1 := &NodeAddL{Num:5}
	num1 = pushFront(num1, 1)
	num1 = pushFront(num1, 3)

	// 5 -> 9 -> 2
	num2 := &NodeAddL{Num:2}
	num2 = pushFront(num2, 9)
	num2 = pushFront(num2, 5)

	// 9 -> 0 -> 7
	result := AddLinkedNumbers(num1, num2)
	for tmp := result; tmp != nil; tmp = tmp.Next {
		fmt.Print(tmp.Num)
		if tmp.Next != nil {
			fmt.Print(" -> ")
		}
	}
	fmt.Println()
}

An its output:

student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./main
9 -> 0 -> 7
student@ubuntu:~/[[ROOT]]/test$