Problem with metohds

Prime b

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

4 Replies

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Vulpes14y ago
Accepted 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 b14y ago
Got ya
Vulpes14y ago
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 b14y ago
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