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Q.Java Program to swap two numbers without using third variable.

Another approach is to add and subtract the values of the two variables. By subtracting the value of one variable from the sum of the two variables, the value of the other variable can be obtained. This value can then be subtracted from the sum to obtain the original value of the first variable. Using this technique, it is possible to swap two variables in Java without using a third variable.

The following example code shows a way to swap two numbers without using a third variable in Java:

Output:

Before swapping value of x is 20 and y is 30

After swapping value of x is 30 and y is 20