用c语言编写的计算24点的小程序

#include  <stdio.h>
#include   <stdlib.h>
#include   <iostream.h>
using namespace std; 
const double PRECISION = 1E-6; 
const int COUNT_OF_NUMBER  = 4; 
const int NUMBER_TO_BE_CAL = 24; 
double number[COUNT_OF_NUMBER]; 
string expression[COUNT_OF_NUMBER]; 
bool Search(int n) 
{ 
    if (n == 1) { 
        if ( fabs(number[0] - NUMBER_TO_BE_CAL) < PRECISION ) { 
            cout << expression[0] << endl; 
            return true; 
        } else { 
            return false; 
        } 
    } 
    for (int i = 0; i < n; i++) { 
        for (int j = i + 1; j < n; j++) { 
            double a, b; 
            string expa, expb; 
            a = number[i]; 
            b = number[j]; 
            number[j] = number[n - 1]; 
            expa = expression[i]; 
            expb = expression[j]; 
            expression[j] = expression[n - 1]; 
            expression[i] = '(' + expa + '+' + expb + ')';