Square of a number

To rephrase it: You're calling for some functionality (or method). Now this functionality might need some parameters. For eg. If I want you to give me a +1, I will be calling a method, say "givePlusOne" but then to whom will you givePlusOne to? You should give it to me! How will you know this? By passing my name as parameter/argument. givePlusOne("Johnson")

For example, look at the following line of code:

void display (int a) {
    System.out.println(a);
}

Here, the int a is the argument of the display() method. So when you need to call a method inside your code with argument you do this in this way:

methodName(argument variable or value);

For our example it can be:

display(5);

or it also can be:

int myNumber = 10;
display(myNumber);

In this example you need to perform square of 5.so you need to pass value 5. syntax to call method with an argument is: Name of method(value you need to pass) example: sqr(8);