linker command failed with exit code 1

Question

I have been creating a Map class for creating allocated 2d Array. When I tried to Complier the file there is linker command failed to show up.
Can anyone could help me figure out?

here is my Cpp file
#include<iostream>
#include "Map.hpp"
Map::Map()
{
// arr=nullptr;
Map::setMapWidth(0);
Map::setMapHeight(0);
}

Map::Map(int y,int x)
{
mapHeight=y;
mapWidth=x;
arr = new int*[y];
for(int i = 0; i < y; ++i) {
arr[i] = new int[x];
}
}

Map::~Map()
{
for(int i = 0; i < mapHeight; ++i) {
delete [] arr[i];
}
delete [] arr;
}

Here is my Header file

#ifndef Map_hpp
#define Map_hpp

#include<string>
#include<stdio.h>
class Map{

private:
int mapWidth;
int mapHeight;
int **arr;

public:
Map();
Map(int width,int height);
~Map();

void setMapWidth(int width);
void setMapHeight(int height);
int getMapWidth(){return mapWidth;}
int getMapHeight(){return mapHeight;}

};
#endif /* Map_hpp */

Answer 1

These two members haven't been defined in the implementation file

void setMapWidth(int width);
void setMapHeight(int height);

They are called from the default constructor and the compiler can not find any definition of them.

Answer 2

thank you for your help!