User Define functions in C++

By: Prof. Fazal Rehman Shamil
Last modified on February 25th, 2021

There are two types of functions, the user defines and built-in functions. Built-in functions are developed by default by our developers of the compiler and already available in our compiler.

we just need to use them. But user defines functions are needed to be declared, defined, and call by the user.

user defined functions C++

Simple C++ program to demonstrate User define  function

Output

11 Welcome to T4Tutorials.com

Dry Run and Explanation of User define  function with SMT

 

Flow of execution of User Define functions in C++
Flow of execution of User Define functions in C++
Which one executed first user defined function or main function
Which one executed first user defined function or main function

Advantages of user-defined functions- C++

  1. User-defined functions help us to divide a big program into smaller parts.
  2. The smaller parts of the program have the following benefits;
    • Easy to understand.
    • Easy to modify.
    • Easy to maintain.
    • Easy to debug.

Some important concepts you must know while working on user-defined functions are mentioned below;

  1. Call by value
  2. Call by reference 

User define function with an array

Prof. Fazal Rehman Shamil