How to swapping of two or three numbers in C# ?

suren v

Hai,Good Evening Dudes,

I want to swapping 2 or 3 numbers in C#...Like This

a=5,b=3 how to change this a=3, b=5 ? ? ?

Thanks In Advance Frnds :)

6 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes13y ago
Accepted answer
You can also create a Swap method using 'ref' parameters:

using System;

namespace SwapNumber
{
class Program
{
static void Main(string[] args)
{
int a = 5, b = 3;
Swap(ref a, ref b);
Console.WriteLine("a={0} and b={1}", a, b);
Console.ReadKey();
}

static void Swap(ref int a, ref int b)
{
int c = a;
a = b;
b = c;
}
}
}
suren v13y ago
Hai, Dudes ,

Really thanks for yours replies :)

Special thanks Vulpes and Sandeep :)
Jignesh Trivedi13y ago
hi,
you may use bitwise exclusive or operator to swap two number
example.
int x = 10;
int y = 12;
x ^= y;
y ^= x;
x ^= y;

you may also swap string without use third string
string a = "jignesh";
string b = "Trivedi";
a += b;
b = a.Substring(0, a.Length - b.Length);
a = a.Substring(b.Length);

hope this will help you.
Riyaz Akhtar13y ago
If you are looking for normal swapping solution then you can flow any of the above solution.

But when i saw your question, i remembered my college day's question : swapping two number without any 3rd variable

if you are looking for the same then here is the answer:

Method 1:

int a = 3;
int b = 5;
a = a + b;
b = a - b;
a = a - b;

Method 2:

int a = 3;
int b = 5;
a = a * b;
b = a / b;
a = a / b;
Sandeep Singh Shekhawat13y ago
using System;

namespace SwapNumber

{

    class Program

    {

        static void Main(string[] args)

        {

            int a = 5, b = 3;

            int c = 0;

            c = a;

            a = b;

            b = c;

            Console.WriteLine("a={0} and b={1}", a, b);

            Console.ReadKey();

        }

    }

}
Sandeep Singh Shekhawat13y ago
using System;
namespace SwapNumber
{
  class Program
{
  static void Main(string[] args)
{
  int firtsNumber = 10, secondNumber = 20;
  Console.WriteLine("First Number = {0} and Second Number = {1}", firtsNumber, secondNumber);
firtsNumber += secondNumber;
secondNumber = firtsNumber - secondNumber;
firtsNumber = firtsNumber - secondNumber;
  Console.WriteLine("First Number = {0} and Second Number = {1}", firtsNumber, secondNumber);
  Console.ReadLine();
}
}
}