C++ function to calculate the factorial of Integer

Write C++ function to calculate the factorial value of any integer as an argument.

Source Code:

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#include<iostream> using namespace std; int factorial(int); int main() { int x,f; cout<<"Enter number : "; cin>>x; f=factorial(x); cout<<"The factorial is :"<<f; return 0; } int factorial(int a) { int fact=1; while(a>=1) { fact=fact*a; a--; } return fact; }

Enter number : 5
The factorial is : 120