一个题目.cpp

一些c++小程序

#include<iostream.h>
const int xsize=80;
const int ysize=25;
struct  node
{
	int xstep;
	  int ystep;
	    char *result;
};
void  show(int n)
{
	int size=(n+2)*(n+2),sum=0,step=n+1,pos=n+1;
	 char *point[xsize][ysize],down[3]="↓",up[3]="↑",right[3]="→",left[3]="←",kong[3]="  ";
	  node *list=new node[size];
	    for(int i=0;i<size;i++)
		{
			list[i].xstep=i+1;
			 list[i].ystep=1;
			  list[i].result=right;
			   if(sum<4)
			   {
				   if(i==n+1||i==2*(n+1)||i==3*(n+1))
				   {
				      list[i].result=kong;
				        sum++;
				   }
			   }
		}
		sum=0;
		for(i=step;i<size&&step>=0;i=i+step)
		{
			for(int j=i+1;j<size;j++)
			{  
			  int temp=list[j].xstep;
				list[j].xstep=list[i].ystep+list[i].xstep-list[j].ystep;
				  list[j].ystep=temp+list[i].ystep-list[i].xstep;
				   if(list[j].result==right)
					   list[j].result=down;
				     else
						 if(list[j].result==down)
							 list[j].result=left;
						 else
							 if(list[j].result==left)
								 list[j].result=up;
							 else
								 if(list[j].result==up)
									 list[j].result=right;
			}
			  if(sum==2)
			  {
				  step--;
				   sum=0;
			  }
			  sum++;
		}
		for(i=0;i<ysize;i++)
			for(int j=0;j<xsize;j++)
				point[i][j]=kong;
			for(i=0;i<size;i++)
				point[list[i].ystep][list[i].xstep]=list[i].result;
			  for(i=0;i<=n+2;i++)
			  {
				  for(int j=0;j<=n+2;j++)
				  {
					  if(point[i][j]==kong)
						  cout<<"   ";
					    else
						  cout<<point[i][j]<<" "; 
				  }
						  cout<<endl<<endl;
			  }
				delete []list;	  
}
void  main()
{
	int n;
	  cout<<"请输入n的值,n小于23!(因为屏幕大小限制)"<<endl;
	   cin>>n;
	    while(n>22)
		{
			cout<<"n太大!"<<endl;
			  cin>>n;
		}
		  show(n);
		    cout<<endl;
}