DevC++ different than VS.net C++? - problem!

This is a discussion on DevC++ different than VS.net C++? - problem! within the C++ Programming forums, part of the General Programming Boards category; Hi everyone! I'm working on a program (actually modifying existing code) that simulates a maze when given user input, and ...

  1. #1
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    DevC++ different than VS.net C++? - problem!

    Hi everyone! I'm working on a program (actually modifying existing code) that simulates a maze when given user input, and what I'm supposed to do is implement a recursive function that will allow a 'mouse' to escape the maze (find the exit). I have done so, the program compiles and executes successfully in VS.net, but when I run it in DevC++, it gives me the following error for each recursive call to the exitCurrCell() function:

    123 C:\Documents and Settings\Pbrooks4\My Documents\Visual Studio Projects\Kellett_CS3330_5\Source1.cpp no matching function for call to `Maze::exitCurrCell(Cell)'

    It sees the passed parameter as type (Cell) and not (Cell&), a cell object. Any ideas on what is causing this? I like to build in VS.net, because it is a little more user-friendly, but our projects must be compileable in DevC++, because this is what our instructor uses to grade. Code below and attached as a .cpp file. As usual, thanks in advance!
    Code:
    #include <iostream>
    #include <string>
    #include <stack>
    #include <cstdlib>
    using namespace std;
    
    template<class T>
    class Stack : public stack<T> {
    public:
        T pop() {
            T tmp = stack<T>::top();
            stack<T>::pop();
            return tmp;
        }
    };
    
    class Cell {
    public:
        Cell(int i = 0, int j = 0) {
            x = i; y = j;
        }
        bool operator== (const Cell& c) const {
            return x == c.x && y == c.y;
        }
    private:
        int x, y;
        friend class Maze;
    };
    
    class Maze {
    public:
        Maze();
        void exitCurrCell(Cell&);
    	Cell getEnterCell();
    private:
        Cell currentCell, exitCell, entryCell, currCell;
        const char exitMarker, entryMarker, visited, passage, wall;
        Stack<Cell> mazeStack;
        char **store;         // array of strings;
        void pushUnvisited(int,int);
        int rows, cols;
        friend ostream& operator<< (ostream& out, const Maze& maze) {
            for (int row = 0; row <= maze.rows+1; row++)
                out << maze.store[row] << endl;
            out << endl;
            return out;
        }
    };
    
    Maze::Maze() : exitMarker('e'), entryMarker('m'), visited('.'),
                   passage('0'), wall('1') {
        Stack<char*> mazeRows;
        char str[80], *s;
        int col, row = 0;
        cout << "Enter a rectangular maze using the following "
             << "characters:\nm - entry\ne - exit\n1 - wall\n0 - passage\n"
             << "Enter one line at at time; end with Ctrl-z:\n";
        while (cin >> str) {
            row++;
            cols = strlen(str);
            s = new char[cols+3];    // two more cells for borderline columns;
            mazeRows.push(s);
            strcpy(s+1,str);
            s[0] = s[cols+1] = wall; // fill the borderline cells with 1s;
            s[cols+2] = '\0';
            if (strchr(s,exitMarker) != 0) {
                 exitCell.x = row;
                 exitCell.y = strchr(s,exitMarker) - s;
            }
            if (strchr(s,entryMarker) != 0) {
                 entryCell.x = row;
                 entryCell.y = strchr(s,entryMarker) - s;
            }
        }
        rows = row;
        store = new char*[rows+2];        // create a 1D array of pointers;
        store[0] = new char[cols+3];      // a borderline row;
        for ( ; !mazeRows.empty(); row--) {
            store[row] = mazeRows.pop();
        }
        store[rows+1] = new char[cols+3]; // another borderline row;
        store[0][cols+2] = store[rows+1][cols+2] = '\0';
        for (col = 0; col <= cols+1; col++) {
            store[0][col] = wall;         // fill the borderline rows with 1s;
            store[rows+1][col] = wall;
        }
    }
    
    void Maze::pushUnvisited(int row, int col) {
        if (store[row][col] == passage || store[row][col] == exitMarker) {
            mazeStack.push(Cell(row,col));
        }
    }
    
    Cell Maze::getEnterCell()
    {
    	return entryCell;
    }
     static int i =0;
    void Maze::exitCurrCell(Cell& currCell) {
    	i++;
    	cout << i << "    ";
        int row, col;
    	currentCell = currCell;
            row = currentCell.x;
            col = currentCell.y;
    		if(!(currentCell == entryCell))
    		{
                store[row][col] = visited;
    		}
    		cout << *this << endl;
    		cout << "x = " << currentCell.x << ", y = " << currCell.y << endl; 
           // cout << *this;      
        if(currCell == exitCell)
    	{
    		cout << "The mouse is now out of the maze!" << endl;
    		exit(1);
    	}
    	else
    	{
    		if(store[row-1][col] == passage || store[row-1][col] == exitMarker)
            {
                exitCurrCell(Cell(row-1,col));    // Pass cell to this function           
            }
    	    if(store[row+1][col] == passage || store[row+1][col] == exitMarker)
    	    {
    		    exitCurrCell(Cell(row+1, col));
    	    }
    	    if(store[row][col-1] == passage || store[row][col-1] == exitMarker)
    	    {
                exitCurrCell(Cell(row, col-1));
    	    }
            if(store[row][col+1] == passage || store[row][col+1] == exitMarker)
    	    {
    		    exitCurrCell(Cell(row, col+1));
    	    }
    	}
    }
    
    int main() {
    	Maze myMaze;
    	Cell entCell = myMaze.getEnterCell();
        myMaze.exitCurrCell(entCell);
        
    	return 0;
    }
    Attached Files Attached Files

  2. #2
    (?<!re)tired Mario F.'s Avatar
    Join Date
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    Portugal
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    Code:
    exitCurrCell(Cell(row-1,col));
    You cannot pass a temporary when the expected parameter is a non-const reference. It's one of the reasons why you should use const by default and only not use it when it doesn't work with const.

    change exitCurrCell prototype to void exitCurrCell(const Cell&). Don't forget to also alter the definition.
    The programmer’s wife tells him: “Run to the store and pick up a loaf of bread. If they have eggs, get a dozen.”
    The programmer comes home with 12 loaves of bread.


    Originally Posted by brewbuck:
    Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.

  3. #3
    Registered User
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    121
    Thanks Mario, I'll do that when I get home.

    -Patrick

  4. #4
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    Yeah, that seemed to do it. Muito obrigado, Mario! :-) Thanks for the info!

    -Patrick

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