请教，我用C++编出来了这题，但是C语言不会，谁帮我改一下！！！
#include <iostream> #include <string>
#include <cmath>
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 Judgement = false; //判断是否有解。
int count = 0;
void Search(int n)
{
if (n == 1)
{
if (fabs(number[0] - NUMBER_TO_BE_CAL) <= PRECISION) //对于除法，要小心小数的精确位数
{
cout << expression[0] << "\t\t";
Judgement = true;
count++;
if((count % 3)==0)
cout<<endl;
}
}
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]; //递归之后，n比以前小一位，所以可以不停向前赋值
expa = expression[i];
expb = expression[j];
expression[j] = expression[n - 1]; //递归之后，n比以前小一位，所以可以不停向前赋值
expression[i] = '(' + expa + '+' + expb + ')'; //加法不需要分顺序
number[i] = a + b;
Search(n-1);
expression[i] = '(' + expa + '-' + expb + ')'; //减法应该分顺序，减数以及被减数
number[i] = a - b;
Search(n-1);
expression[i] = '(' + expb + '-' + expa + ')'; //减法应该分顺序，减数以及被减数
number[i] = b - a;
Search(n-1);
expression[i] = '(' + expa + '*' + expb + ')'; //乘法不需要分顺序
number[i] = a * b;
Search(n-1);
if (b != 0)
{
expression[i] = '(' + expa + '/' + expb + ')'; //除法应该分顺序，除数以及被除数
number[i] = a / b;
Search(n-1);
}
if (a != 0)
{
expression[i] = '(' + expb + '/' + expa + ')'; //除法应该分顺序，除数以及被除数
number[i] = b / a;
Search(n-1);
}
number[i] = a; //这4句语句是为了防止如果上面几种可能都失败了的话,
number[j] = b; //就把原来的赋值撤消回去,以无干扰的正确的进入到下一次
expression[i] = expa; //for循环队列中。
expression[j] = expb; //
}
}
}
int main()
{
cout<<"Please input 4 value of Cards:\n";
for (int i = 0; i < COUNT_OF_NUMBER; i++)
{
char buffer[20];
cout<<"The "<<i+1<<"th card:";
cin >> number[i];
itoa(number[i], buffer, 10); //itoa()函数的作用是把第一个参数(数值)传送到第二个参数(字符串)中去，第三个
//参数(int型)是该数值在字符串里以什么进制存放。
expression[i] = buffer;
}
cout<<endl;
Search(COUNT_OF_NUMBER) ;
if(Judgement==true)
{
cout << "\nSuccess." << endl;
cout<<"The sum of the ways = "<<count<<endl;
}
else
{
cout << "Fail." << endl;
}
return 0;
}
6．计算24游戏。
要求：输入四个数通过加减乘除计算出24，显示计算过程，并提示成功信息。
