Selfcreated class an array[2] is causing problems

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Hi ! Anytime i want to compile i get error message (C++ forbides comparisons between pointers and integers; RecordLu used but not defined ).Why ?

C++

<pre>#include <iostream>
#include <array>

 using namespace std;
    class Punkt {
        public: int XYCoord [2]={};
        void setupCoord (int x, int y){
            XYCoord[0]=x;
            XYCoord[1]=y;
        }
    };
    class Rechteck {
        public: Punkt ReCoordLu,ReCoordRo;

        double flaeche(double x, double y){
            double xy=x*y;
            return xy;
            }
        bool contains ( Punkt &p){
            Punkt *ConTemp1=&p;
            Punkt ConTemp ;
            ConTemp = *ConTemp1;

            if (ConTemp.XYCoord[0]>=&&ReCoordLu.XYCoord[0]&&ConTemp.XYCoord[1]<=ReCoordRo.XYCoord[1]){
                return true;}
            else{
                return false;}
                };
        bool contains (Rechteck &){
            if (1){
                return true;}
            else
                return false;
            }
        };
int main()
{/* Rechteck sharedRectangle (Rechteck a , Rechteck b){
            Rechteck c;
            return Rechteck c;
            } */

        Punkt P1,P2;
        P1.setupCoord(1,1);
        P2.setupCoord(5,5);
        Rechteck Rechteck1;
        Rechteck1.ReCoordLu.setupCoord(3,3);
        Rechteck1.ReCoordRo.setupCoord(9,9);

        cout<<"hello"<<P2.XYCoord[0]<<Rechteck1.ReCoordLu.XYCoord[0]<<Rechteck1.flaeche(5,5);

        return 0;};

What I have tried:

made Punkt ReCordLu public for function contain to recognize it. Revised code but cant find problem.

Posted 10-Mar-17 1:25am

Member 13050643

Updated 10-Mar-17 6:46am

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2 solutions

Solution 1

The error message contains a line number. So have a look at that line:

if (ConTemp.XYCoord[0]>=&&ReCoordLu.XYCoord[0]&&ConTemp.XYCoord[1]<=ReCoordRo.XYCoord[1])

Do you see it now? It must be

if (ConTemp.XYCoord[0]>=ReCoordLu.XYCoord[0]&&ConTemp.XYCoord[1]<=ReCoordRo.XYCoord[1])

The two && are treated as address of operators here which are pointers.

Posted 10-Mar-17 3:02am

Jochen Arndt

Updated 10-Mar-17 3:44am

v2

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Member 13050643 · Accepted Answer · 2017-03-10T06:46:00

Okay thx now i it working, but i dont understand why P4(3,7)is giving returnvalue true (1) , since here 7(ConTemp.XYCoord[1]) is bigger than 5 (ReCoordRo.XYCoord[1]) ?

C++

<pre>#include <iostream>
#include <array>

 using namespace std;
    class Punkt {
        public: int XYCoord [2]={};
        void setupCoord (int x, int y){
            XYCoord[0]=x;
            XYCoord[1]=y;
        }
    };
    class Rechteck {
        public: Punkt ReCoordLu,ReCoordRo;

        double flaeche(double x, double y){
            double xy=x*y;
            return xy;
            }
        bool contains ( Punkt &p){
            Punkt *ConTemp1=&p;
            Punkt ConTemp ;
            ConTemp = *ConTemp1;

            if (ConTemp.XYCoord[0]>=ReCoordLu.XYCoord[0]&&ConTemp.XYCoord[1]<=ReCoordRo.XYCoord[1]){
                return true;}
            else{
                return false;}
                };
        bool contains (Rechteck &){
            if (1){
                return true;}
            else
                return false;
            }
        };
int main()
{/* Rechteck sharedRectangle (Rechteck a , Rechteck b){
            Rechteck c;
            return Rechteck c;
            } */

        Punkt P1,P2,P3,P4;
        P1.setupCoord(1,1);
        P2.setupCoord(5,5);
        P3.setupCoord(3,3);
        P4.setupCoord(3,7);
        Rechteck Rechteck1;
        Rechteck1.ReCoordLu.setupCoord(3,3);
        Rechteck1.ReCoordRo.setupCoord(9,9);


        cout<<"hello"<<P2.XYCoord[0]<<Rechteck1.ReCoordLu.XYCoord[0]
        <<Rechteck1.flaeche(5,5)<<Rechteck1.contains(P4) ;

        return 0;};