Product（大数相乘）

Description

The problem is to multiply two integers X, Y. (0<=X,Y<10250)

Input

The input will consist of a set of pairs of lines. Each line in pair contains one multiplyer.

Output

For each input pair of lines the output line should consist one integer the product.

Sample Input

12
12
2
222222222222222222222222

Sample Output

144
444444444444444444444444

HINT

#include<iostream>
#include<string.h>
using namespace std;
int main()
{
	char a[10000],b[10000];
	int i,j,t1,c,t2;
	while(cin>>a>>b)
	{
		int sum[10000]={0};
		int x=strlen(a);
		int y=strlen(b);
		t1=9999;t2=9999;
		for(i=x-1;i>=0;i--)
		{
			for(j=y-1;j>=0;j--)
				sum[t1--]+=((a[i]-'0')*(b[j]-'0'));
			t2--;
			t1=t2;
		}
		c=0;
		for(i=9999;i>=0;i--)
		{
			sum[i]+=c;
		    c=0;
		    if(sum[i]>9)
			{
				c=sum[i]/10;
				sum[i]=sum[i]%10;
			}
		}
		for(i=0;i<10000;i++)
		{
			if(sum[i]!=0)
				break;
		}
		for(j=i;j<10000;j++)
			cout<<sum[j];
		cout<<endl;
	}
	return 0;
}