By | 27.12.2016

# Factorial of a number using class

Write a C++ Program to find Factorial of a number using class. Here’s simple C++ Program to find Factorial of a number using class 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 a number using class which is successfully compiled and run on Windows System to produce desired output as shown below :

### SOURCE CODE : :

```/* C++ Program to find Factorial of a number using class */

#include<iostream>
using namespace std;

class factorial
{
private:
int n,n1,f=1;
public:
void input();
void calc();
void display();
};

void factorial::input()
{
cout<<"\nEnter any number :: ";
cin>>n;
}

void factorial::calc()
{
n1=n;
if(n==0||n==1)
cout<<"\nFactorial of Number [ "<<n<<" ] is :: 1\n";
else
{
while(n>0)
{
f=f*n;
n--;
}
}

}

void factorial::display()
{
cout<<"\nFactorial of [ "<<n1<<" ] is :: "<<f<<"\n";
}

int main ()
{
factorial f;
f.input();
f.calc();
f.display();

return 0;
}```

### OUTPUT : :

```/* C++ Program to find Factorial of a number using class */

Enter any number :: 6

Factorial of [ 6 ] is :: 720

Process returned 0```

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

If you found any error or any queries related to the above program or any questions or reviews , you wanna to ask from us ,you may Contact Us through our contact Page or you can also comment below in the comment section.We will try our best to reach up to you in short interval.

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My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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It would seem this program works without (n==0||n==1) and a condition of (n<0) is missing, no?

then it always so 1

we can calculate by using while( n>0) we donot need to include n==1 and n==0

a class can create with in the class?

why int n,n1,f are in private’

.

Void factorial