In this tutorial, we will discuss Cpp program to find factorial using Function. There are many ways to calculate a factorial using C programming language. In this tutorial, we are going to learn about how to calculate factorial of a given number using the C function. Dec 29, 2010  verdverm (2) Is there a factorial function defined in a header file someplace in.nix or c/c. I don't want to have to write this anytime i need it, kind of annoying. All googles report a bunch of noobie problems.

• Factorial Function In Excel
• Factorial Function In C
• C++ Factorial Function

Factorial program in C using a for loop, using recursion and by creating a function. Factorial is represented by '!', so five factorial is written as (5!), n factorial as (n!). Also, n! = n*(n-1)*(n-2)*(n-3)..3.2.1 and zero factorial is defined as one, i.e., 0! = 1.

Factorial in C using a for loop

#include <stdio.h>
int main()
{
int c, n, f =1;
printf('Enter a number to calculate its factorialn');
scanf('%d',&n);

for(c =1; c <= n; c++)
f = f * c;
printf('Factorial of %d = %dn', n, f);
return0;
}

Output of C factorial program:

Download Factorial program.

Factorial program in C using recursion

#include<stdio.h>
long factorial(int);
int main()
{

Factorial Function In Excel

int n;
long f;
printf('Enter an integer to find its factorialn');
scanf('%d',&n);
if(n <0)
printf('Factorial of negative integers isn't defined.n');
else
{
f = factorial(n);
printf('%d! = %ldn', n, f);
}
return0;

Factorial Function In C

}

long factorial(int n)
{
if(n 0)// Base case
return1;
else
return(n*factorial(n-1));
}

In recursion, a function calls itself. In the above program, the factorial function is calling itself. To solve a problem using recursion, you must first express its solution in recursive form.

C program to find factorial of a number

#include <stdio.h>

long factorial(int);

C++ Factorial Function

int main()
{
int n;

printf('Enter a number to calculate its factorialn');
scanf('%d',&n);

printf('%d! = %ldn', n, factorial(n));

return0;
}

long factorial(int n)
{
int c;
long r =1;

for(c =1; c <= n; c++)
r = r * c;

return r;
}

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