#include<iostream>
#include<string.h>
#include<cstdio>
using namespace std;
int main()
{
    int inc=0,inc1;
    int i,r;
    int temp;
    char a[44],b[44];
    int a1[45],b1[45];
    int c[90]={0};
    memset(c,0,sizeof(c));
    inc=0;
     scanf("%s",a);
    scanf("%s",b);
    int len1,len2;
    len1=strlen(a);
    len2=strlen(b);
    for(i=0;i<len1;i++)
    {
        a1[len1-i-1]=a[i]-'0';
    }
    for(i=0;i<len2;i++)
    {
        b1[len2-i-1]=b[i]-'0';
    }
    for(i=0;i<len1;i++)
    {
    for(r=0;r<len2;r++)
    {
        temp=c[i+r];
        c[i+r]=(c[i+r]+a1[i]*b1[r]+inc)%10;
        inc=(temp+a1[i]*b1[r]+inc)/10;
    }
  c[i+r]+=inc;
        inc =0;
    }
    inc1=0;
     for(i=0;i<30;i++)
     {
         c[i]=(c[i]+inc1)%10;
         inc1=(c[i]+inc1)/10;
     }
    for(i=30;i>=0;i--)
    if(c[i]!=0)
    {
       temp=i;
       break;
    }
    for(i=temp;i>=0;i--)
    cout<<c[i];
    return 0;
}

• 应该是90不是30 (0) kevin_black 2011-09-23 17:01:23