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# Problem 1854. Factorial: Unlimited Size : java.math

This challenge is an application of java.math that allows unlimited precision calculations. The primary reference sites are Java Math, Java BigDecimal, and Java BigInteger.

The usage of BigDecimal function multiply will be essential.

Java Math tutorial: (Simplified summary that is believed correct)

```vd-decimal value, vstr-string, vi-integer value
xBD=java.math.BigDecimal(vd);  % valid vd,vstr,vi creates xBD a BigDecimal variable
import java.math.*;  % simplifies statements
xBD=BigDecimal(vstr);
```
```xmultiplyzBD=xBD.multiply(BigDecimal(z));  % multiply input requires BD type
```
```To convert java to string of unlimited length can be achieved via java toString or Matlab char
```
```xstr=toString(xBD)  or xstr=char(xBD)
```

Input: N [1< N < 1000]

Output: Y (char variable of Y=N! or a BigDecimal variable)

Factorial Calculator

Related Challenges:

1. Usage of java math

```2. nchoosek_large (full precision)
2. Next Prime
3. factor_large
4. Factorial
```

### Solution Stats

84.85% Correct | 15.15% Incorrect
Last solution submitted on May 14, 2018