浮点数高精度相加（杭电1753A+B）

 

#include<iostream>
#include<cstring>
#define MAX_LEN 400
using namespace std;
int a1[MAX_LEN+10];
int a2[MAX_LEN+10];
int b1[MAX_LEN+10];
int b2[MAX_LEN+10];
char  s1[MAX_LEN+10];
char  s2[MAX_LEN+10];
int main()
{
     //2.3566
     //5.36666666
     while(cin>>s1>>s2){
     memset(a1,0,sizeof(a1));
     memset(a2,0,sizeof(a2));
     memset(b1,0,sizeof(b1));
     memset(b2,0,sizeof(b2));
     char *pdot1 = strchr(s1,'.');
     if(pdot1==NULL)
        pdot1 = s1+strlen(s1);
     int i = 0;
     char *p;
     for(p=pdot1+1; *p!='\0'; ++p)
      a2[i++] = *p-'0';
      i = 0;
     for(p=pdot1-1; p>=s1; --p)
      a1[i++] = *p-'0';
     char *pdot2 = strchr(s2,'.');
     if(pdot2==NULL)
        pdot2 = s2+strlen(s2);
     i = 0;
     for(p=pdot2+1; *p!='\0'; ++p)
      b2[i++] = *p-'0';
     i = 0;
     for(p=pdot2-1; p>=s2; --p)
      b1[i++] = *p-'0';
     int sign = 0;
     for(i = MAX_LEN-1; i>=0; --i){
        a2[i] += b2[i];
        if(a2[i]>=10){
          a2[i]-=10;
          if(i==0)
            sign = 1;
          else a2[i-1] +=1;
        }
     }

     a1[0] += sign;
     for(i=0; i<MAX_LEN; ++i){
        a1[i] += b1[i];
        if(a1[i]>=10){
          a1[i] -= 10;
          a1[i+1] += 1;
        }
     }
     bool Isprint = 0;
     for(i=MAX_LEN; i>=0; --i)
       if(Isprint)
         cout<<a1[i];
       else if(a1[i]){
             cout<<a1[i];
           Isprint = 1;
       }
       if(!Isprint)
        cout<<'0';
     Isprint = 0;
     for(i=MAX_LEN-1; i>=0; --i)
       if(a2[i]){
         Isprint = 1;
         break;
       }
     if(Isprint){
       cout<<'.';
       for(int j=0; j<=i; ++j)
        cout<<a2[j];
     }
     cout<<endl;
     memset(s1,0,sizeof(s1));
     memset(s2,0,sizeof(s2));
    }
     //system("pause");
     return 0;
}