Functions in C++ || C++ Complete Course || Beginners to Advance| Urdu/Hindi | BJM Technologies
C++ Functions
In this tutorial, we will learn about the C++ function and function expressions with the help of examples.
A function is a block of code that performs a specific task.
Suppose we need to create a program to create a circle and color it. We can create two functions to solve this problem:
a function to draw the circle
a function to color the circle
Dividing a complex problem into smaller chunks makes our program easy to understand and reusable.
There are two types of function:
Standard Library Functions: Predefined in C++
User-defined Function: Created by users
In this tutorial, we will focus mostly on user-defined functions.
C++ User-defined Function
C++ allows the programmer to define their own function.
A user-defined function groups code to perform a specific task and that group of code is given a name (identifier).
When the function is invoked from any part of the program, it all executes the codes defined in the body of the function.
C++ Function Declaration
The syntax to declare a function is:
returnType functionName (parameter1, parameter2,...) {
// function body
}
Here's an example of a function declaration.
// function declaration
void greet() {
cout (( "Hello World";
}
Here,
the name of the function is greet()
the return type of the function is void
the empty parentheses mean it doesn't have any parameters
the function body is written inside {}
Note: We will learn about returnType and parameters later in this tutorial.
Calling a Function
In the above program, we have declared a function named greet(). To use the greet() function, we need to call it.
Here's how we can call the above greet() function.
int main() {
// calling a function
greet();
}
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