uva465--BigNumber

不得不说这题对我而言就是一种折磨。。。

真心做了好久~

开始我是在输入时处理前导零的情况，结果输出过不去了。

后面还是想了想，用scanf输入就行了。。

懂得了原来 >> 输入是调用的等号操作~

不过终于还是被我A掉了！

//#define LOCAL  
#include <stdio.h>  
#include <string.h>  
#include <iostream>  
#include <math.h>  
  
using namespace std;  
  
#define MAXN 80 + 10  
#define MAX_INT 2147483647  
  
const int maxn = 10000;  
char char1[maxn];
char char2[maxn];
  
// 大数类的定义   
struct bign  
{  
    int len, s[maxn];  
    bign()  
    {  
        memset(s, 0, sizeof(s));  
        len = 1;  
    }  
      
    // 重载操作符‘=’用于赋值字符数组  
	bign operator = (const char* num)
	{
		int k = 0;
		while(num[k] - '0' == 0)
			num++;
		len = strlen(num);
		for(int i = 0; i < len; i++)
		{
			s[i] = num[len - i - 1] - '0';
		}
		return *this;
	}
          
    // 重载操作符‘=’用于赋值数字   
    bign operator = (int num)  
    {  
        char s[maxn];  
        sprintf(s, "%d", num);  
        *this = s;  
        return *this;  
    }  
      
    // 参数为数字类型的构造函数  
    bign(int num)  
    {  
        *this = num;  
    }   
      
    // 参数为字符数组类型的构造函数  
    bign(const char* num)  
    {  
        *this = num;  
    }   
      
    // 将字符数组转化成字符串  
    string str() const  
    {  
        string res = "";  
        int i;  
        for(i = 0; i < len; i++)  
        {  
            res = (char)(s[i] + '0') + res;  
        }  
        if(s[i - 1] == 0)  
            res = "";  
        if(res == "")   
            res = "0";  
        return res;  
    }   
      
    // 重载操作符 +  
    bign operator + (const bign& b) const  
    {  
        bign c;  
        c.len = 0;  
        for(int i = 0, g = 0; g || i < max(len, b.len); i++)  
        {  
            int x = g;  
            if(i < len)  
                x += s[i];  
            if(i < b.len)  
                x += b.s[i];  
            c.s[c.len++] = x % 10;  
            g = x / 10;  
        }  
        return c;  
    }  
      
    // 重载操作符 +=   
    bign operator += (const bign& b)  
    {  
        *this = *this + b;  
        return *this;  
    }   
      
    // 重载操作符 -  
    // 重载操作符 -=  
    // 重载操作符 *  
    bign operator * (const bign& b) const  
    {  
        bign c;  
        c.len = 0;  
        int i, j;  
        int g;   
        int temp;  
        for(i = 0; i < len; i++)  
        {  
            c.len = i;  
            for(j = 0; j < b.len; j++)  
            {  
                c.s[c.len] += s[i]  * b.s[j] ; // 按位乘   
                g = 0;  
                c.len++;  
                temp = c.len - 1;  
                while(c.s[temp] >= 10)   
                {  
                    g = c.s[temp] / 10; // 保存进位   
                    c.s[temp] = c.s[temp] % 10; // 保存余数   
                    temp++; // 将标志向后推移   
                    c.s[temp] += g; // 将余数保存在下一位   
                }  
                  
            }  
        }  
        c.len = temp + 1;     
        return c;  
    }  
      
    // 重载操作符 *=  
    bign operator *= (const bign& b)  
    {  
        *this = *this * b;  
        return *this;  
    }   
    // 重载操作符 /  
    // 重载操作符 /=   
      
    // 重载比较操作符 <  
    bool operator < (const bign& b) const  
    {  
        if(len != b.len) return len < b.len;  
        for(int i = len - 1; i >= 0; i--)  
            if(s[i] != b.s[i])  
                return s[i] < b.s[i];  
        return false;  
    }   
      
    // 重载比较操作符 >  
    bool operator > (const bign& b) const  
    {  
        return b < *this;  
    }  
      
    // 重载比较操作符 <=  
    bool operator <= (const bign& b) const  
    {  
        return !(b < *this);  
    }  
      
    // 重载比较操作符 >=  
    bool operator >= (const bign& b) const  
    {  
        return !(*this < b);  
    }  
      
    // 重载比较操作符 !=  
    bool operator != (const bign& b) const  
    {  
        return b < *this || *this < b;  
    }  
      
    // 重载比较操作符 ==  
    bool operator == (const bign& b) const  
    {  
        return !(b < *this) && !(*this < b);  
    }  
};  
  
    // 重载操作符 >>  
istream& operator >> (istream &in, bign& x)  
{  
    string s;  
    in >> s;  
    x = s.c_str();
    return in;   
}   
      
// 重载操作符 <<  
ostream& operator << (ostream &out, const bign& x)  
{  
    out << x.str();  
    return out;  
}   
  
int main()  
{  
#ifdef LOCAL  
    freopen("input.txt", "r", stdin);  
    //freopen("output.txt", "w", stdout);  
#endif  
	bign num1 = 0;
	bign num2 = 0;
	bign result;
	char ch;
    while(scanf("%s", char1) != EOF)  
    {  
		scanf(" %c", &ch);
    	scanf("%s", char2);
    	num1 = char1;
    	num2 = char2;
    	printf("%s %c %s\n", char1, ch, char2);
    	if(num1 > MAX_INT)
    		printf("first number too big\n");
   		if(num2 > MAX_INT)
   			printf("second number too big\n");
    	switch(ch)
    	{
	    	case '+':
	    		result = num1 + num2;
	    		break;
    		case '*':
    			result = num1 * num2;
	    }
	    
	    if(result > MAX_INT)
	    	printf("result too big\n");
    }  
    return 0;  
}