Exchange Two integer variable value without using third variable:-

public static void ExchangeInteger()

{

int a = 10;

int b = 5;

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

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

a = a + b;

// Now a would be 15

b = a - b;

// Now b would be 15-5=10 ........

a = a - b;

// Now a would be 15-10=5........

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

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

Console.ReadLine();

}

Calling above method,

1. static void Main(string[] args)
2. {
3. clsExchangevariable.ExchangeInteger();
4. }

Output