By | 27.12.2016

# Factorial of number using function

Write a C++ program to find factorial of number using function. Here’s simple c++ program to find factorial of a number using while loop in C++ Programming Language.

## What are Functions ?

Function is a block of statements that performs some operations. All C++ programs have at least one function – function called “main()”. This function is entry-point of your program.

A function declaration tells the compiler about a function’s name, return type, and parameters. A function definition provides the actual body of the function.

## Defining a Function : :

The general form of a C++ function definition is as follows:

return_type Function_Name( list of parameters )
{
//function’s body
}

• return_type : suggests what the function will return. It can be void, int, char, some pointer or even a class object.
• Function_Name : is the name of the function, using the function name it is called.
• Parameters : are variables to hold values of arguments passed while function is called. A function may or may not contain parameter list.
• Function body : is he part where the code statements are written.

Below is the source code for C++ program to find factorial of number using function which is successfully compiled and run on Windows System to produce desired output as shown below :

### SOURCE CODE : :

/*  C++ program to find factorial of number using function  */

#include<iostream>
using namespace std;

void factorial(int);

int main()
{
int n;
cout<<"Enter any number :: ";
cin>>n;
factorial(n);

}

void factorial(int n)
{
int f=1,n1;
n1=n;
if(n==0)
cout<<"\nFactorial of [ "<<n1<<"! ] is 1.\n";
else
{
while(n>0)
{
f=f*n;
n--;
}
}
cout<<"\nFactorial of [ "<<n1<<"! ] is "<<f<<"\n";

}

### OUTPUT : :

/*  C++ program to find factorial of number using function  */

Enter any number :: 7

Factorial of [ 7! ] is 5040

Process returned 0

Above is the source code for C++ program to find factorial of number using function which is successfully compiled and run on Windows System.The Output of the program is shown above .

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