Answer to Question #194380 in C++ for Taj

Question

Write a C++ program which perform the following:

1. Create a Class factorial

2. Create Private Member Variable and initialize it with Member

initialization list and with value zero

3. Now, take inputs from user

4. Create a Public Member Function Calculate( ) outside the class,

to calculate the factorial of a given input

5. Create another Public Member Function Result( ) outside the

class, to print the results on screen

6. Now, create a constant object of the class which perform following:

a. Passes the values to the Calculate( ) function

b. Call the Result( ) function to show result

Answer 1

#include <iostream>

class Factorial
{
    mutable int factorial;

  public:

    Factorial() : factorial(0)
    {
    }

    void Calculate(int v) const;

    void Result() const;
    
};

void Factorial::Calculate(int v) const
{
    factorial = 1;

    if(v > 1)
    {
        for(int i = 1; i <= v; ++i) 
        {
            factorial *= i;
        }
    }
}

void Factorial::Result() const
{
    std::cout << "Factorial value is " << factorial << "\n";
}

int main()
{
    int v;
    std::cout << "Enter the value: ";
    std::cin >> v;
    if(!std::cin || v < 0)
    {
        std::cout << "Bad input\n";
        return 1;
    }

    const Factorial obj;
    obj.Calculate(v);
    obj.Result();
    
    return 0;    
}