Problem with metohds

Question

Create a new program named Reverse4, which contains
a method that reverses the positions of four variables.
Write a Main() method that demonstrates the method
works correctly.

its should be something like

int temp;

temp = first;
first = second;
second = third;

etc, i donno how to solve it

Vulpes · Answer

This is a question on the use of 'ref' parameters. You can do it like this: using System; class Program { static void Main() { int first = 1; int second = 2; int third = 3; int fourth = 4; Reverse4(ref first, ref second, ref third, ref fourth); Console.WriteLine("First = {0}", first); Console.WriteLine("Second = {0}", second); Console.WriteLine("Third = {0}", third); Console.WriteLine("Fourth = {0}", fourth); Console.ReadKey(); } static void Reverse4(ref int first, ref int second, ref int third, ref int fourth) { int temp = first; first = fourth; fourth = temp; temp = second; second = third; third = temp; } }

Prime b · Answer

Got ya

Vulpes · Answer

The key to doing this question is to realize that all you need to do is to swap the first and fourth variables and the second and third. You can, of course, only swap two variables at a time and you need to use a temporary variable to hold one variable before it is overwritten by the other. The 'ref' parameters ensure that the swapped variables will be persisted to the calling method.

Prime b · Answer

I had it like this In main method i had 111 222 333 444 and in reverse method i did it like that int temp; temp = first; first = fourth; fourth = third; third = second; second = temp; The output would be 111,222,333,444 and then 444,111,222,333

Problem with metohds

Answers (4)