Operator overloading in C#

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1.00/5 (2 votes)

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sir
I hae written code for operator overloading but it is not working.
here's the program :
---------------------------------

using System;
class space
{
    int x, y, z;
    public space(int a, int b, int c)
    {
        x = a;
        y = b;
        z = c;
    }
    public void display()
    {
        Console.Write("" + x);
        Console.Write("" + y);
        Console.Write("" + z);
    }
    public static space operator -(space s)
    {
        s.x = -s.x;
        s.y = -s.y;
        s.z = -s.z;
    }
}
 class TestMain
 {
     public static void Main()
     {
         space s = new space(10, -20, -40);
         Console.Write("S:");
         -s.display();
         Console.Write("S:");
         Console.Write("S:");
         -s.display();
     }

 }
it shows the following errors:
Error	1	'space.operator -(space)': not all code paths return a value	C:\Users\LENOVO PC\Documents\Visual Studio 2010\Projects\operator_overload\operator_overload\Program.cs	17	25	operator_overload
Error	2	Only assignment, call, increment, decrement, and new object expressions can be used as a statement	C:\Users\LENOVO PC\Documents\Visual Studio 2010\Projects\operator_overload\operator_overload\Program.cs	30	10	operator_overload
Error	3	Operator '-' cannot be applied to operand of type 'void'	C:\Users\LENOVO PC\Documents\Visual Studio 2010\Projects\operator_overload\operator_overload\Program.cs	33	10	operator_overload
Error	4	Only assignment, call, increment, decrement, and new object expressions can be used as a statement	C:\Users\LENOVO PC\Documents\Visual Studio 2010\Projects\operator_overload\operator_overload\Program.cs	33	10	operator_overload

What I have tried:

sir  i have tried 
-s.display() 
but no results..

Posted 21-Sep-16 8:22am

tusharkaushik

Updated 21-Sep-16 8:33am

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Comments

[no name] 21-Sep-16 14:30pm

What do you think trying "-s.display()" would do? You have to correct the compilation errors first!

tusharkaushik 21-Sep-16 14:31pm

Now i've modified the code :
------------------------------------
using System;
class space
{
int x, y, z;
public space(int a, int b, int c)
{
x = a;
y = b;
z = c;
}
public void display()
{
Console.Write("" + x);
Console.Write("" + y);
Console.Write("" + z);
}
public static space operator - (space s)
{
s.x = -s.x;
s.y = -s.y;
s.z = -s.z;
return -s;
}
}
class TestMain
{
public static void Main()
{
space s = new space(10, -20, 30);
Console.Write("S: \n\n");
s.display();

Console.Write("\n S:\n");
//Console.Write("S:\n");
s.display();
Console.ReadLine();
}

}

i have written the value (

NOw showing this output :
10,-20 30

1 solution

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Vijay Gill · Answer 1 · 2016-09-21T08:33:00

You need to return some value from the operator overloading method. so do something like "return s;"

For the other error, the compiler is trying to apply "-" on the method display. If you want to call display on "negative of s" then do something like "(-s).display();".

PS: I am not sure what you are trying to do there, so I cannot suggest better code. I just "fixed" what's broken.