Returns the factorial of a number.

/*
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* And open the template in the editor.
*/

Package factorial;

/**
* @ Function: Calculate the factorial of a number.
*
* @ Author: Administrator
*/
Public class factorialtest {

// Factorial method to calculate factorial
Public double factorial (int n ){

Double sum = 1;

For (INT I = 1; I <= N; I ++ ){
Sum = sum * I;
}
Return sum;
}

// Program entry
Public static void main (string [] ARGs ){

Double result;

Factorialtest F = new factorialtest (); // declare the factorialtest object

Result = f. factorial (5); // call the factorial function to calculate the factorial of N and assign it to result

System. Out. println ("n! = "+ Result); // print
}
} // End