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printing with cout in private functions

billycro (17)
Hello all,
Im having an error im not expecting,

cout is not defined in this scope
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void QueenSolver:: printMe(){
    for(int x=0; x<8; x++)
        for(int y=0; y<8; y++){
                if(spaces[x][y]) cout<<"x";
                else cout<<"o";
        }
        cout<<"\n";
}


I include iostream at the start of the .cpp file. The function printMe is a private void function in the class queensolver. other than this i dont find any errors. but maybe the community knows something i havent learned yet.

Thank you in advanced!

Full source below


Header
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#ifndef QUEENSOLVER_H
#define QUEENSOLVER_H
#include <iostream>

class QueenSolver
{
    public:
        int spaces[8][8];
        QueenSolver();
        bool solve(int);
    protected:
    private:
        bool queensSafe();
        void printMe();
};

#endif // QUEENSOLVER_H


implementation
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#include "QueenSolver.h"
#include <iostream>
QueenSolver::QueenSolver()
{
        for(int x=0  ; x<64; x++)
            spaces[x/8][x%8]=0;
}

bool QueenSolver::solve(int x){
 for(int q=0; q<8; q++){
        spaces[x][q]=1;
        if(x==7 && queensSafe()){
            printMe();
            return true;
        }
        else if(queensSafe()){
            return solve(x+1);
        }
        else
            spaces[x][q]=0;
 }
}

bool QueenSolver::queensSafe(){
    //good rows
    for(int x=0; x<7; x++){
        bool thisRow=false;
        for(int y=0; y<7; y++)
        {
            if(thisRow && spaces[x][y])
                return false;
        }
    }
    //good cols
    for(int x=0; x<7; x++){
        bool thisRow=false;
        for(int y=0; y<7; y++)
        {
            if(thisRow && spaces[y][x])
                return false;
        }
    }
    //good diagonal

    return true;
}

void QueenSolver:: printMe(){
    for(int x=0; x<8; x++)
        for(int y=0; y<8; y++){
                if(spaces[x][y]) cout<<"x";
                else cout<<"o";
        }
        cout<<"\n";
}


runner 
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#include <iostream>
#include "QueenSolver.cpp"
using namespace std

int main(){
    QueenSolver q=new QueenSolver();
    q.solve();

    return 0;
}
Last edited on
ne555 (10692)
cout resides in the std namespace.
billycro (17)
would i then call std.cout in order for the function to find the correct cout? or is there another way to achieve what im trying to?

ive worked alot in java this is my first tackle at cpp
Zhuge (4664)
Use std::cout and it should work.
billycro (17)
thank you zhuge

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