C++ program to find factorial of a number|in 7 ways

C++ program to find factorial of a number|in 7 ways

In this tutorial, we will discuss the C++ program to find factorial of a number|in 7 ways

In this post, we are going to learn how to find the factorial of a number of the given number

What is the factorial of given number  (n)?

The factorial of a number (n) is the product of all positive integers from 1 upto n (n is the given number).

It is simply denoted by n!.

Example

if you want to find the factorial for number 5, you can follow this method.
Factorial of 5 will be 5*4*3*2*1=120
So, 5!=120.

Program 1

Find factorial of a number – using stranded method

#include <iostream>
#include <conio.h>
using namespace std;
    int main()
{
    int i,num=6,fact=1;
    for(i=1; i<=num; i++)
    {
        fact=fact*i;
    }
   cout<<"Factorial of "<<num<< " is: "<<fact;
    getch();
    return 0;
}

When the above code is executed it produces the following output

Factorial of 6 is: 720

In this program

1. Integer variables i,num and fact are declared and initialized
2. the program finds the factorial of a number using for loop
3. Then, the program is displayed the factorial of a number using cout<<

Program 2

Find factorial of a number – using for loop

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int i,num,fact=1;
   cout<<"Enter the number for find factorial: ";
    cin>>num;
    for(i=1; i<=num; i++)
    {
        fact=fact*i;
    }
    cout<<"Factorial of "<<num<<" is:"<<fact;
    getch();

    return 0;
}

When the above code is executed it produces the following output

Enter the number for find factorial: 7
Factorial of 7 is: 5040

The program allows the user to enter a value and it finds and displays factorial of the given number using for loop in C++ language

Program 3

Find factorial of a number – using while loop

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int num,fact=1;
    cout<<"Enter the number for find factorial\n";
    cin>>num;
    int i=1;
    while(i<=num){
        fact=fact*i;
        i++;
    }
    cout<<"Factorial of "<<num<< "is : "<<fact;
    getch();
    return 0;
}

When the above code is executed it produces the following output

Enter the number for find factorial
6
Factorial of 7 is : 720

The program allows the user to enter a value and it finds and displays factorial of the given number using the while loop in C++ language

Program 4

Find factorial of a number – using do-while loop

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int num,fact=1;
    cout<<"Enter the number for find factorial\n";
    cin>>num;
    int i=1;
  do{
        fact=fact*i;
        i++;
    }  while(i<=num);
    cout<<"Factorial of" <<num<<"is: "<<fact;
    getch();
    return 0;
}

When the above code is executed it produces the following output

Enter the number for find factorial: 4
4
Factorial of 4 is : 24

The program allows the user to enter a value and it finds and displays factorial of the given number using the do-while loop in C++ language

Program 5

Find factorial of a number – using function

#include <iostream>
#include <conio.h>
using namespace std;
int fact();
int main()
{

    cout<<"Enter the number for find factorial\n";
fact();

}
  int fact(){
       int i,num,fact=1;
        cin>>num;
        i=1;
while(i<=num){
    fact=fact*i;
    i++;
    }
    cout<<"Factorial of"<< num<<" is :"<<fact;
    getch();
    return 0;
}

When the above code is executed it produces the following output

Enter the number to find factorial
6
Factorial of 6 is:720

The program allows the user to enter a value and it finds and displays factorial of the given number using the function in C++ lamguage

Program 6

Find factorial of a number – using recursion

#include <iostream>
#include <conio.h>
using namespace std;
long int findFact(int num);

int main()
{
    int num;
    cout<<"Enter a positive integer: ";
    cin>>num;
    cout<<"factorial of "<<num<<" is "<<findFact(num);
getch();
    return 0;
}
long int findFact(int num){
if (num>=1)
    return num*findFact(num-1);
else
    return 1;

}

When the above code is executed it produces the following output

Enter a positive integer: 6
factorial of 6 is: 720

The program allows the user to enter a value and it finds and displays factorial of the given number using the recursive function in C++ language

Program 7

Find factorial of a number – using the pointer

#include <iostream>
#include <conio.h>
using namespace std;

void Factorial(int, long int*);
int main()
{
    long int fact;
    int num;

    cout<<"Enter a integer to find factorial\n";
   cin>>num;
    Factorial(num,&fact);
    cout<<"factorial of "<<num<<"is: "<<fact;
    getch();
    return 0;
}
void Factorial(int n, long int *fact){
int i;

*fact=1;
for(i=1; i<=n; i++)
    *fact=*fact*i;

}

When the above code is executed it produces the following output

Enter a integerto find factorial
6
factorial of 6 is: 720

The program allows the user to enter a value and it finds and displays factorial of the given number using the pointer in C++ language

Suggested for you

Function in C++ language

For loop in C++ language

While loop in C++ language

Do-while loop C++ language

Pointer in C++ language

 

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