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  • 10106 Product

    #include <iostream>
    #include <algorithm>
    #include <cstring>
    using namespace std;
    int mutil(char * x, char * y , char * z)
    {
    	char * px = x;
    	char * py = y;
    	int carry =0 , temp;
    	if(strcmp(x,"0") == 0 || strcmp(y,"0") == 0)
    	{
    		z[0] = 0;
    		return 1;
    	}
    	int i,j;
    	for(i = 0 ; *(i+px) ; ++i)
    	{
    		carry = 0;
    		for(j = 0 ; *(py+j) ; ++j)
    		{
    			temp = (*(px+i)-'0')*(*(py+j)-'0')+carry+z[i+j];
    
    			carry = temp/10;
    			temp = temp%10;
    			z[i+j] = temp;
    		}
    		if(carry!= 0)
    		{
    			z[i+j] = carry;
    		}
    	}
    	if(carry != 0)
    	{
    		return i+j;
    	}
    	return i+j-1;
    }
    
    int main()
    {
    	char buff1[1000],buff2[1000];
    	char result[100001] = {0};
    	int len1,len2;
    	int result_len = 0;
    		while(	cin>>buff1>>buff2)
    		{
    				len1 = strlen(buff1);
    				len2 = strlen(buff2);
    				result_len = 0;
    
    				reverse(buff1,len1+buff1);
    				reverse(buff2,buff2+len2);
    				fill(result,result+sizeof(result),0);
    				result_len = mutil(buff1,buff2,result);
    
    				result[result_len] = 0;
    				reverse(result,result+result_len);
    				transform(result,result+result_len,result,bind2nd(plus<int>(),48));
    				cout<<result<<endl;
    		}
    	return 0;
    }
    
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  • 原文地址:https://www.cnblogs.com/UnGeek/p/2566394.html
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