How to Create a C++ Function
In computer programming, functions are a set of codes. Many functions are predefined in C++, Like, clrscr(); and perror, but users can also define their own functions. When the same set of tasks is to be used in different places, instead of typing the coding over and over again, you can easily use functions to improve readability and reduce code length.
Understand the function syntax.Before call a function, first declare it usingvoid. After declaring a functionstarfunction, define arguments on it usingfunction body. When defining of a function is completed. call it anywhere using its name and a semicolon. like:starfunction();.
Start with a program without a user defined function.Write these line of codes in your C++ IDE. This isn't totally necessary, but to help you learn, start with a program without a user defined function and run it.#include<iostream> #include<conio.h> usingnamespacestd main std"Data Type Range"endl std"Char -128 to 127"endl std"Short -32,768 to 32,767"endl std"Int System dependent"endl std"Long -2,147,483,648 to 2,147,483,647"endl getch
Run the output.It will give you ranges of different data types. Now you can add a user defined functionstarfunctionin it.
Write CPP program with a function.Write these line of codes in you C++ IDE, compile the code, and run it.
#include<iostream> #include<conio.h> usingnamespacestd starfunction //Function Declaration main starfunction//Function Call std"Data Type Range"endl starfunction//Function Call std"Char -128 to 127"endl std"Short -32,768 to 32,767"endl std"Int System dependent"endl std"Long -2,147,483,648 to 2,147,483,647"endl starfunction//Function Call getch starfunction// Function Declator a a a std stdendl
- At the bottom of the code, instarfunctionwe define afor loopand print 27 (*) stars.
- When we callstarfunctionfunction anywhere else, without typingfor loopit prints 27 (*) stars.
Run the output with the function.It will give a new look to your program.
Video: C Programming Tutorial | Learn C programming | C language
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