5E. Where Do Parameters Come from?

Some beginners are uncomfortable with parameters. Look at this function definition.

  // sqr(x) returns the square of x.

  int sqr(int x)
  {
    return x*x;
  }

The answer is that the responsibility for choosing a value for x lies with the function call, not with the function definition. Statement

  int w = sqr(20);

  int n = sqr(40);

It is crucial that you learn to compartmentalize, to think only about a small piece of a computer program at a time. When writing a function definition, don't think about where its parameters will come from. That is not your problem. It will be handled someplace else.