UVA 10106

//继续水一个大数字乘法，绝对的模板题........
#include <stdio.h>
#include <string.h>
#define MAX_LEN 400
int main()
{
    int i, j;
    int len1, len2;
    int a[MAX_LEN+10], b[MAX_LEN+10], c[MAX_LEN*2+10];
    char str1[MAX_LEN+10], str2[MAX_LEN+10];
    while( gets(str1) )
    {
        memset(c, 0, sizeof(c) );
        gets(str2);
        len1 = strlen(str1);
        len2 = strlen(str2);
        for( j = 0, i = len1-1; i>=0; i-- )
            a[j++] = str1[i] - '0';
        for( j = 0, i = len2-1; i>=0; i-- )
            b[j++] = str2[i] - '0';
        for( i = 0; i < len2; i++ )
            for( j = 0; j < len1; j++ )
                c[i+j] += b[i] * a[j];
         for( i = 0; i < MAX_LEN*2; i++ )
            if( c[i] >= 10 )
             {   
                    c[i+1] += c[i] /10;
                    c[i] %= 10;
             }
         for( i = MAX_LEN*2; (c[i]==0)&&(i>=0); i-- );
            if( i >= 0 )
                for(; i >=0; i-- )
                    printf( "%d",c[i] );
            else
                printf( "0" );
         printf( "\n" );
    }
    return 0;
}