Great Work!

You now have a C++ program which reads board data, stores the board in your program, and prints the board with nice formatting. Great work! You are ready to begin writing the A* search function.

The A* search function will take a starting point and an ending point on the board, and it will plot a path from beginning to end.

At this point, your program should look like the program below. You have built this short program from scratch, so now is great time to review the code to ensure you recall how each part of it works.

#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
using std::cout;
using std::ifstream;
using std::istringstream;
using std::string;
using std::vector;

enum class State {kEmpty, kObstacle};

vector<State> ParseLine(string line) {
    istringstream sline(line);
    int n;
    char c;
    vector<State> row;
    while (sline >> n >> c && c == ',') {
      if (n == 0) {
        row.push_back(State::kEmpty);
      } else {
        row.push_back(State::kObstacle);
      }
    }
    return row;
}

vector<vector<State>> ReadBoardFile(string path) {
  ifstream myfile (path);
  vector<vector<State>> board{};
  if (myfile) {
    string line;
    while (getline(myfile, line)) {
      vector<State> row = ParseLine(line);
      board.push_back(row);
    }
  }
  return board;
}

string CellString(State cell) {
  switch(cell) {
    case State::kObstacle: return "⛰️   ";
    default: return "0   "; 
  }
}

void PrintBoard(const vector<vector<State>> board) {
  for (int i = 0; i < board.size(); i++) {
    for (int j = 0; j < board[i].size(); j++) {
      cout << CellString(board[i][j]);
    }
    cout << "\n";
  }
}

int main() {
  auto board = ReadBoardFile("1.board");
  PrintBoard(board);
}