Bull Math（java大数相乘）

Link：点击打开链接

Problem：

Bull Math Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 12950 Accepted: 6674 Description Bulls are so much better at math than the cows. They can multiply huge integers together and get perfectly precise answers ... or so they say. Farmer John wonders if their answers are correct. Help him check the bulls' answers. Read in two positive integers (no more than 40 digits each) and compute their product. Output it as a normal number (with no extra leading zeros). FJ asks that you do this yourself; don't use a special library function for the multiplication. Input * Lines 1..2: Each line contains a single decimal number. Output * Line 1: The exact product of the two input lines Sample Input 11111111111111 1111111111 Sample Output 12345679011110987654321 Source USACO 2004 November

import java.util.*;

import java.io.*;

import java.math.*;

import java.text.*;

public class Main{

public static void main(String[] args)

{

BigInteger x,y,ans;

Scanner cin=new Scanner(System.in);

while(cin.hasNext())

{

x=cin.nextBigInteger();

y=cin.nextBigInteger();

ans=x.multiply(y);

System.out.println(ans);

}

}

}