c语言实现100000阶乘,100000的阶乘

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.math.BigInteger;

/*

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*/

/**

*

* @author corywu

*/

public class Factorial {

public static double factorial(int num) {

if (num == 1) {

return 1;

} else {

return num * factorial(num - 1);

}

}

public static void main(String args[]) {

FileOutputStream fos = null;

try {

System.out.println(factorial(10));

BigInteger x = BigInteger.valueOf(1);

for (int i = 2; i <= 100000; i++) {

x = x.multiply(BigInteger.valueOf(i));

}

fos = new FileOutputStream("c:\\abc.txt");

OutputStreamWriter opsw = new OutputStreamWriter(fos);

try {

opsw.write(x.toString());

opsw.flush();

} catch (IOException ex) {

ex.printStackTrace();

}

} catch (FileNotFoundException ex) {

ex.printStackTrace();

} finally {

try {

fos.close();

} catch (IOException ex) {

ex.printStackTrace();

}

}

}

}