C Programming Tutorial – Functions

This is the source code from the C Programming Tutorial. In this source code, you are going to learn about c functions in a C Programming language.

What is Function?

A function is a block of code that can perform a specific task. In C Programming there are two types of c functions

1. Standard function
2. User-defined function

Standard function

A function which is predefined in c programming is called a standard function.

Here is an example of a standard function.

//standard fuctions in c

#include <stdio.h>
#include <stdlib.h>

int main () {

   printf("I'm standard function in c programmig");

   return 0;
}

Here main() and printf() functions are standard function.  So, we use main()function to execute the c program and printf() function to print text on the screen.

User-defined function

Now let us discuss user-defined function.

User-defined function are the functions which are defined by the user.

Example of user-defined function

#include <stdio.h>
#include <stdlib.h>
 
void name(); // function prototype declaration
 
int main () {
 
name(); // function call
printf("I am main function \n");
 
return 0;
}
 
// function definition
void name(){
printf("I am name function \n");
}