C++ Functions (with Overloading)

What is a Function?

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

Functions help organize code and reduce repetition.

Function Declaration

A function declaration tells the compiler about the function before it is used.

Function Definition

The function definition contains the actual implementation.

Calling a Function

You call a function by using its name followed by parentheses.

Parameters and Return Values

Functions can take inputs (parameters) and return outputs.

Function Overloading

Function overloading allows multiple functions with the same name but different parameter types.

The compiler determines which function to call based on the arguments.

Using Overloaded Functions

The correct function is automatically selected based on input types.

Pass by Value

By default, C++ passes arguments by value (a copy is made).

Pass by Reference

Using references allows a function to modify the original variable.

Default Parameters

C++ allows default values for function parameters.

Why Functions are Important

Functions are essential for writing clean and reusable code.

• Reduce repetition
• Improve readability
• Organize logic

Common Mistakes

Be careful with these:

• Using the same parameter types in overloaded functions
• Forgetting return statements
• Confusing value vs reference

Practice

Create two overloaded functions that add integers and doubles.

Need Help?