Simple program using function in c++

Simple program using function in c++

Function

function refers to a segment that groups code to perform a specific task. 

A function is a group of statements that together perform a task. Every C++ program has at least one function, which is main(), and all the most trivial programs can define additional functions.
A function declaration tell us the compiler about a function's name, return type, and the parameters. A function definition provides us the actual body of the any function.

Now we understand the function through a  program.

We declare a function "add(int , int)".And call the function through the "sum = add(a,b)".in last we give the definition as "add(int x, int y)" .

The progtram is following as....

#include <iostream.h>
#include<conio.h>

// Function prototype (declaration)
int add(int, int); 

void  main()
{
    int a,b, sum;
    cout<<"Enters two numbers: ";
    cin >>b >>b;

    // Function call
    sum = add(a,b);
    cout << "Sum is = " << sum;
    getch();
}

// Function definition
int add(int x, int y)
{
    int add;
    add = x + y;

    // Return statement
    return add;
}

OUTPUT

 

Enters two numbers: 4

4

Sum is :8