24点-code1

 #include <iostream>
 #include <string>
 #include <cstdlib>
 #include <cmath>
 using namespace std;

 const double Threshold = 1E-;
 const int CardsNumber=;
 const int ResultValue = ;
 double numbers[CardsNumber];
 string result[CardsNumber];

 bool Points24(int n)
 {
     if (n == )
     {
         if (fabs(numbers[] - ResultValue) < Threshold)
         {
             cout << result[] << endl;
             return true;
         }
         else
         {
             return false;
         }
     }
     for (int i = ; i < n; i++)
     {
         for (int j = i+; j < n; j++)
         {
             double a, b;
             string expa, expb;
             a = numbers[i];
             b = numbers[j];
             numbers[j] = numbers[n - ];

             expa = result[i];
             expb = result[j];
             result[j] = result[n - ];

             numbers[i] = a + b;
             result[i] = "(" + expa + "+" + expb + ")";
             if (Points24(n - ))
             {
                 //cout << result[i]<<endl;
                 return true;
             }

             numbers[i] = a - b;
             result[i] = "(" + expa + "-" + expb + ")";
             if (Points24(n - ))
             {
                 return true;
             }

             numbers[i] = b - a;
             result[i] = "(" + expb + "-" + expa + ")";
             if (Points24(n - ))
             {
                 return true;
             }

             numbers[i] = a * b;
             result[i] = "(" + expa + "*" + expb + ")";
             if (Points24(n - ))
             {
                 return true;
             }

             if (b)
             {
                 numbers[i] = a/b;
                 result[i] = "(" + expa + "/" + expb + ")";
                 if (Points24(n - ))
                 {
                     return true;
                 }
             }
             if (a)
             {
                 numbers[i] = b / a;
                 result[i] = "(" + expb + "/" + expa + ")";
                 if (Points24(n - ))
                 {
                     return true;
                 }
             }
             numbers[i] = a;
             numbers[j] = b;
             result[i] = expa;
             result[j] = expb;
         }
     }
     return false;

 }
 int main()
 {
     int x;
     for (int i = ; i < CardsNumber; i++)
     {
         cout << "the NO." << i << " number is: ";
         cin >> x;
         numbers[i] = x;
         char buffer[];
         itoa(x,buffer,);
         result[i] = buffer;
     }
     if (Points24(CardsNumber))
         cout << "Success" << endl;
     else cout << "Fail" << endl;
     return ;
 }