CODEWITHSUNDEEP
c++file-iomacosmaze
dzl
dzl

Reputation: 906

Reading in an ascii 'maze' into a 2d array

I'm writing code to read in a 7x15 block of text in a file that will represent a 'maze'. 

#include <iostream>
#include <fstream>
#include <string>
#include "board.h"  

int main()
{
    char charBoard[7][15];  //the array we will use to scan the maze and modify it
    ifstream loadMaze("maze");  //the fstream we will use to take in a maze
    char temp; //our temperary holder of each char we read in

    for(int i = 0;i < 7; i++)
    {

        for(int j = 0; j < 15; j++)
    {
        temp= loadMaze.get();
        charBoard[i][j] = temp;
        cout << charBoard[i][j];  //testing
    }
    cout << endl;
}

return 0;
}

this was my original draft but this didnt work as it kept returning ? for each char it read. This is the maze im testing with:

  #############
              #
############  #
              #
 ######### ####
 # !       #   
############

EDIT: The cout is printing this: 

  #############


#
############ 
 #

  #
 ######### 
####
 # !      
 #   
#########

Am I not escaping \n's?

I've been coding for a few hours so I think its a simple mistake I'm not catching that's tripping me up right now. Thanks!

Upvotes: 2

Views: 2788

Answers (4)

Jacob
Jacob

Reputation: 34621

Try an absolute path like "c:\MyMazes\maze".

Throw in a system("cd") to see where the current directory is. If you're having trouble finding the current directory, check out this SO discussion

Here's the complete code - this should display your entire maze (if possible) and the current directory.

 char charBoard[7][15];      //the array we will use to scan the maze and modify it
 system("cd");
     ifstream loadMaze("c:\\MyMazes\\maze");  //the fstream we will use to take in a maze

 if(!loadMaze.fail())
 {
    for(int i = 0;i < 7; i++)
    {
        // Display a new line
        cout<<endl;
        for(int j = 0; j < 15; j++)
        {
             //Read the maze character
             loadMaze.get(charBoard[i][j]);
             cout << charBoard[i][j];  //testing
        }
        // Read the newline
        loadMaze.get();
    }
    return 0;
 }
 return 1;

Upvotes: 3

Smashery
Smashery

Reputation: 59673

Check whether the file opening failed or not. You can find this out by checking if it's good:

http://www.cplusplus.com/reference/iostream/ios/good/

If the file opening has failed, then try writing in the absolute path to the file (C:/Documents and Settings/.../maze), to see whether that works. If it does, it's just the file path that's wrong, and you'll have to play with that.

Upvotes: 0

rlbond
rlbond

Reputation: 67829

try adding the line

if (!loadMaze) throw 1;

after the declaration of loadMaze, this will throw an exception if the file isn't there. This is a hack, really you should throw a real error. But it works to test.

Upvotes: 0

aJ.
aJ.

Reputation: 35460

Can you check whether extraction from file is proper: using good() API of ifstream

for(int j = 0; j < 15; j++)
{
    if(!loadMaze.good())
    {
        cout << "path incorrect";

    }

    temp= loadMaze.get();


    cout << "temp = " << temp << endl; //testing
    charBoard[i][j] = temp;
    cout << charBoard[i][j];  //testing
}

OR

in the beginning itself:

ifstream loadMaze("maze"); 
if(!loadMaze.good())
{
  //ERROR
}

Upvotes: 0

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