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C Academy · Lesson

Defining and Calling Functions

Write functions with parameters and return values, and understand the importance of modular programming

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Defining and Calling Functions

Functions allow us to break a program into smaller, reusable parts.

In this lesson, you will learn how to:

  • Define and call functions.
  • Use function parameters and return values.
  • Write modular and efficient code.
Defining and Calling Functions — illustration 1

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What is a Function?

A function is a block of code that performs a specific task.

Functions improve code readability, reusability, and organization.

Example syntax:

returnType functionName(parameters) { // Function body }

All lessons in this course

  1. Defining and Calling Functions
  2. Function Prototypes and Scope
  3. Recursion in C
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