ПОМОГИТЕ, ДРУЗЬЯ ПРОГРАММИСТЫ!
^^)
package com.javarush.task.task15.task1531;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.HashMap;
/*
Факториал
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int input = Integer.parseInt(reader.readLine());
reader.close();
System.out.println(factorial(input));
}
public static String factorial(int n) {
//add your code here
if (n < 0)
System.out.println(n + "! = " + 0);
else if (n == 0) {
System.out.println(n + "! = " + 1);
} else {
System.out.print(n + "! = factorial(" + n + ") = ");
for (int i = 1; i <= n; i++) {
if (i == n)
System.out.print(i);
else
System.out.print(i + "*");
}
System.out.println();
System.out.println(fact(n));
}
return "";
}
public static BigInteger fact(int a){
BigInteger result = BigInteger.ONE;
for (int i = 1; i <= a; i++) {
result = result.multiply(BigInteger.valueOf(i));
}
return result;
}
}