C++ Program to find Factorial of a number using class

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 .

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Gary Holveck

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

avinash raj

then it always so 1

avinash raj

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

Hamza Hameed

a class can create with in the class?

sam

why int n,n1,f are in private’

dina

.

Osman

Void factorial
I can’t understand please help