Question

I’m trying to read a textfile that I’ve edited with Vim into an array.

The textfile is 30*50 and is composed of single digit numbers. I’ve been going crazy trying to get it to work, but I think I’m having issues due to newline characters. Here’s what I’ve been using:

Map::Map(char* filename)
{
grid[30][50] = (0);
string line;
ifstream m_file(filename);
if (m_file.is_open())
        {
                while(m_file.good())
                 {
                        for (int i = 0; i < 30; i++)
                        {
                        getline(m_file,line);
                                 for (int k = 0; k < 50; k++)
                                {
                                int tnum = atoi(line.c_str());
                                grid[i][k] = tnum;
                                }
                        }
                }
                m_file.close();
        }
};

grid is defined in the header file as int grid[30][50].

The code I use to print is as follows:

void display_room(int trid[30][50])
{
        for (int i = 0; i < 30; i++)
        {
                for (int k = 0; k < 50; k++)
                {
                        mvprintw(i,k,"%d",trid[i][k]);
                };
        };
};

after calling Map sMap = Map(“testmap”);

I’m simply trying to capture the single digit numbers into an array, and reprint that array (using curses). Currently, it reads the testmap file, and prints all zeros, no matter what is in the testmap file.

Answer 1

If I understand Your problem: Your parsing sets the value from the entire line where only a digit should be…

int tnum = atoi(line.c_str());
grid[i][k] = tnum;

Translating the digit (ASCII to an int/byte/… can be done in this way:

grid[i][k] = line[k] - '0';

(Perhaps some casting is needed.)