Functions In C++

Functions (I)
Published by Juan Soulie
Last update on Sep 29, 2009 at 10:51am UTC
Using functions we can structure our programs in a more modular way, accessing all the potential that structured programming can offer to us in C++.

A function is a group of statements that is executed when it is called from some point of the program. The following is its format:


type name ( parameter1, parameter2, ...) { statements }


where:
type is the data type specifier of the data returned by the function.
name is the identifier by which it will be possible to call the function.
parameters (as many as needed): Each parameter consists of a data type specifier followed by an identifier, like any regular variable declaration (for example: int x) and which acts within the function as a regular local variable. They allow to pass arguments to the function when it is called. The different parameters are separated by commas.
statements is the function's body. It is a block of statements surrounded by braces { }.


Here you have the first function example:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
// function example
#include
using namespace std;

int addition (int a, int b)
{
int r;
r=a+b;
return (r);
}

int main ()
{
int z;
z = addition (5,3);
cout << "The result is " << z;
return 0;
}