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# How to find the factorial of a number??

6 Réponses

+ 3

Ayush Raj ,
it is not seen as very helpful when we are going to post a ready-made code, as long as the op has not shown his attempt here.
it is more helpful to give hints and tips, so that the op has a chance to find a solution by himself.

+ 5

the factorial of 4 is 4*3*2*1.
you can use a loop or recursion.
if you need help with your code, show your attempt.

+ 3

First I wanted to explain about factorial.
The basic formula to find a factorial is
n!= n*(n-1)*(n-2)*(n-3)*(n-4)*(n-5)*(n-6).....
suppose we need to find factorial of 5 then we use the formula I.e 5*(5-1)*(5-2)*(5-3)*(5-4)=5*4*3*2*1
=120
symbol of factorial that used in most of the time is !

+ 2

In c++20, you can use the gamma function from the cmath header, it's more concise. For any number, N, it's factorial is
double factorial = std::tgamma(N + 1);
Remember to import the <cmath> header

+ 2

Programming logic
int f=1,n=5;
while(n>0)
{
f=f*n;//f=1*5 I.e5 is stored in f
n--; //n=n-1i.e n=5-1,n=4
}
printf("The factorial of 5 =%d",f);

+ 1

Thank you