Question

Hi I would like to make a coordinate system using c++. I will be getting a few (x,y) coordinates from the user and using it I need to make a coordinate system(more of a map) style. How can I achieve this? It needs to look like the diagram below. Should I use a 2D array or vector and how to make the loop do the marking differently?

(2,0)(4,3)(7,8)
Needs to look like

 **1************
 ***************
 ***************
 ***************
 ***1***********
 ***************
 ***************
 ********1******

This is the code I got so far, but the problem is I can’t mark more than one coordinate in it. I just used 2 for loops to do it

for(int i = -6; i < 7; i++) 
    if (i < 0) 
        cout<<" "<<i; 
    else 
        cout<<"  "<<i; 
cout<<endl; 

for(int i = 0; i < 15; i++) 
    { 
        cout<<(char)(i + 49); 
        for(int j = -6; j < 7; j++) 
        if(i == y - 1 && j == x) 
            cout<<" x "; 
        else 
            cout<<" . "; 

        cout<<(char)(i + 49)<<endl; 
    } 

Please advise. Thanks !!

Answer 1

I would advice you to use either vector<string> or vector<vector<char> > or even vector<vector<string> > depending on what do you intend to store in a cell. If a cell is a single character then probably the first option is the best.
And after that creating the map is really easy:

int n,m;
cin >> n >> m;
vector<string> a(n, string(m, '*');

I am not sure what are the ‘.’ and ‘x’ in the code above but I imaging all that is left for you is to input several pairs of coordinates and replace the respective element in the vector<string> with ‘1’.

Hope this helps.