C++ and Algorithmic Thinking for the Complete Beginner

Chapter 35 Introduction to Subprograms

35.1 What Exactly is a Subprogram?

In computer science, a subprogram is a block of statements packaged as a unit that performs a specific task. A subprogram can be called several times within a program, whenever that specific task needs to be performed.

In C++, a built-in function is an example of such a subprogram. Take the well-known abs() function, for example. It consists of a block of statements packaged as a unit under the name “abs”, and it performs a specific task—it returns the absolute value of a number.

If you are wondering what kind of statements might exist inside the function abs(), here is ...