请高手指点指点，以待改进！！！
本程序在dev c++上通过调试：

#include <iostream.h>
#include <conio.h>
int judge(double a,double b, double c, double d, double e);
void out(double a,double b, double c,double d, double e, int i, int j,int k);
double s[6],t[6];
int main()
{
    double a, b, c, d;
    int m,n=0;
    cout<<"       扑克牌24点小游戏: "<<endl;
    while(1) {
    cout<<endl<<"开始游戏请按1，退出游戏请按0:  ";
    cin>>m;
    if(m==0) {cout<<"呵，下次再来玩,bye^.^!"; break; }
    if(m==1) {
    cout<<"输入四个1~13之间的数："<<endl;
    cin>>a>>b>>c>>d;
    if(a<1||a>13||b<1||b>13||c<1||c>13||d<1||d>13)
    {
       cout<<"输入数据错误，结束本次游戏!"<<endl;
       continue;
    }    
    if(judge(a,b,c,d,24.0)) n=1;
    if(judge(a,c,b,d,24.0)) n=1;
    if(judge(a,d,b,c,24.0)) n=1;
    if(judge(24.0,a,b,c,d)) n=1;  
    if(judge(24.0,b,c,a,d)) n=1;  
    if(judge(24.0,c,b,a,d)) n=1;
    if(judge(24.0,a,b,d,c)) n=1;
    if(judge(24.0,b,d,a,c)) n=1;
    if(judge(24.0,d,b,a,c)) n=1;
    if(judge(24.0,a,d,c,b)) n=1;
    if(judge(24.0,c,d,a,b)) n=1;
    if(judge(24.0,d,c,a,b)) n=1;
    if(judge(24.0,b,d,c,a)) n=1;
    if(judge(24.0,c,b,d,a)) n=1;
    if(judge(24.0,d,b,c,a)) n=1;
    if(n!=1)  cout<<"这四个数不能成24"<<endl;
    n=0;
    } }     
    getchar();
    getchar();
}         
int judge(double a, double b, double c, double d, double e)
{
    int i,j,k;
    double x;
    s[0]=a+b;
    s[1]=a-b;
    s[2]=b-a;
    s[3]=a*b;
    s[4]=a/b;   
    s[5]=b/a;   
    t[0]=c+d;
    t[1]=c-d;
    t[2]=d-c;
    t[3]=c*d;
    t[4]=c/d;  
    t[5]=d/c;
    for(i=0; i<6; i++){
      for(j=0; j<6; j++){
        for(k=0;k<6;k++) {
          if(k==0)  x=s[i]+t[j];
            if(x==e)
            {              
                cout<<"这四个数能成24，具体运算如下:"<<endl;
                out(a,b,c,d,e,i,j,k);  return 1;
            }
          if(k==1)  x=s[i]-t[j];
            if(x==e)
            {
                cout<<"这四个数能成24，具体运算如下:"<<endl;
                out(a,b,c,d,e,i,j,k);  return 1;
            }
          if(k==2)  x=t[j]-s[i];
            if(x==e)
            {
                cout<<"这四个数能成24，具体运算如下:"<<endl;
                out(a,b,c,d,e,i,j,k);  return 1;
            }
          if(k==3)  x=s[i]*t[j];
            if(x==e)
            {
                cout<<"这四个数能成24，具体运算如下:"<<endl;
                out(a,b,c,d,e,i,j,k);  return 1;
            }
          if(k==4)  x=s[i]/t[j];
            if(x==e)
            {
                cout<<"这四个数能成24，具体运算如下:"<<endl;
                out(a,b,c,d,e,i,j,k); return 1;
            }
          if(k==5)  x=t[j]/s[i];
            if(x==e)
            {
                cout<<"这四个数能成24，具体运算如下:"<<endl;
                out(a,b,c,d,e,i,j,k); return 1;
            }
        }}}          
        return 0;    
}