解答C++作业01
#include<iostream>
#include<fstream>
#include<string>
#include<conio.h>
#include<cstdlib>
using namespace std;
int find(char ch,int &x,int &y,string openMaze,int& width )
{ string str;
ifstream fin(openMaze.c_str());
if(!fin)
{cout<<"can't open"<<endl;
return 0;}
while(getline(fin,str))
{ x++;
y=str.find(ch,0);
if(y!=string::npos)
break;
}
width=str.size();
fin.close();
x--;
return 1;
}//find 'e' and return width
int loadMap(string* load,string openMaze,int & height)
{ string str;
ifstream fin(openMaze.c_str());
if(!fin)
{cout<<"can't open"<<endl;
return 0;}
while(getline(fin,str))
{
load[height]=str;
height++;
}
fin.close();
return 1;
}//load the map into a string pointer and return height
//method:
//1.R 2.D 3.L 4.U
//o------>
//| |
//|<-----V
bool findWay(int x,int y,string* load)
{
load[x][y]='O';
if (load[x+1][y]=='x') return true;
if (load[x-1][y]=='x') return true;
if (load[x][y+1]=='x') return true;
if (load[x][y-1]=='x') return true;
if (load[x][y+1]=='.')
{
if(findWay(x,y+1,load)==true)
return true;
}
if (load[x+1][y]=='.')
{
if(findWay(x+1,y,load)==true)
return true;
}
if (load[x][y-1]=='.')
{
if(findWay(x,y-1,load)==true)
return true;
}
if (load[x-1][y]=='.')
{
if(findWay(x-1,y,load)==true)
return true;
}
load[x][y]='.';
return false;
}//use square to sign where it has been ,if can't go through,turn it back to '.'
int main()
{
int i,width=0,height=0;
int x=0,y=0,x1=0,y1=0;
//int director;
string openMaze;
cout<<"which map do you like to play?maze1.txt or maze2.txt?"<<endl;
cin>>openMaze;
cout<<endl;
if(find('e',x,y,openMaze,width))
{cout<<"can find entrance ";
cout<<"x: "<<x<<" y: "<<y<<"!"<<endl;}
else {cout<<"can't find entrance !"<<endl;
return 1;
}
if(find('x',x1,y1,openMaze,width))
{cout<<"can find exit ";
cout<<"x: "<<x1<<" y: "<<y1<<"!"<<endl;}
else {cout<<"can't find exit !"<<endl;
return 1;
}
string* load=new string[width];//create the string pointer to load map
loadMap(load,openMaze,height);
cout<<"the map is :"<<height<<" * "<<width<<" type."<<endl;
load[x][y]='\004';load[x1][y1]='\004';
for (i=0;i<=height;i++)
cout<<load[i]<<endl;
load[x1][y1]='x';
if (findWay(x,y,load))
{
cout<<"can find the way!"<<endl;
for (i=0;i<=height;i++)
cout<<load[i]<<endl;
}
else cout<<"can't find,sorry!"<<endl;
delete [] load;
return 0;
}