Function in C programming

Published on : 2nd Oct 2021
A function is a group of statements used to perform a well-defined task.
Function declaration :
return_type function_name(type1 arg1, type2 argr2, type3 arg3, ...., typen argn);
Function signature : 
All the things present in function declaration except return type is function signature.
Function body :
return_type function_name(type1 arg1, type2 argr2, type3 arg3, ...., typen argn)
{
      // statements
}
Function calling type : 
Call by value : when a value is passed to a function, the process is called call by value.
Call by reference : when an address is passed to a function, the process is called call by reference. 
Function arguments :
Formal arguments : Arguments in function are called formal arguments.  
Actual arguments : Values passed at the time of function calling are called actual arguments. 
Example :
#include <stdio.h>

void func()
{
	printf("Hi, I'm a function.");
}

int main(int argc, char** argv)
{
	func();
	return 0;
}
Output :
Hi, I'm a function.