Question

Imagine we are using a two-dimensional array as the basis for creating the game battleship. In the game of battleship a '~' character entry in the array represents ocean, a '#' character represents a place ion the ocean where part of a ship is present, and an 'H' character represents a place in the ocean where part of a ship is present and has been hit by a torpedo. Thus, a ship with all 'H' characters means the ship has been sunk. Declare a two-dimensional array that is 25x25 that represents the entire ocean and an If statement that prints "HIT" if a torpedo hits a ship given the coordinates X and Y. Write a C++ progam that will read in a file representing a game board with 25 lines where each line has 25 characters corresponding to the description above. An example file might look like:

-------------------------
-------------------------
-------------------------
-----#####---------------
-------------------------
---------------#---------
---------------#---------
---------------#---------
---------------#---------
---------------#---------
-------------------------
-----------#####---------
-------------------------
-#####-------------------
-------------------------
---------#####-----------
------------------#------
------------------#------
------------------#------
------------------#------
--#####-----------#------
-------------------------
-------------------------

-------------------------
-------------------------

(not displaying exactly, should be 25x25)

You should write a function called Fire that will take an X and Y coordinate and print "HIT" if a ship is hit and "MISS" if a ship is missed. If a ship is HIT you shoul update the array with an 'H' character to indicate the ship was hit. If a ship is hit that has already been hit at that location you should print "HIT AGAIN". You should write a second function called FleetSunk that will determine if all the ships have been sunk. Your C++ program must then call these functions until all the ships have been sunk, at which point the program should display "The fleet was destroyed!".

Answer 1

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

string Fire(int x, int y, char ocean[][25]);
bool FleetSunk(char ocean[][25]);

int main() {
   int x{ 0 }, y{ 0 };
   char exiter = 'N';
   char ocean[25][25] = { "~" };
   ifstream OceanFile{ "ocean.txt" };
   string wave, report;

   // Populate the ocean from the file
   if (!OceanFile) cout << "File not found!" << endl;
   for (int i = 0; i < 25; i++) {
           getline(OceanFile, wave);
           for (int j = 0; j < 25; j++) {
               ocean[i][j] = wave[j];
           }
   }

   // Take in and validate user input until all ships are sunk
   while (FleetSunk(ocean) && exiter != 'Y') {
       cout << "Enter x,y coordinates separated by a space to fire or negative coordinates to exit:" << endl;
       cin >> x >> y;
       if (!cin.fail() && x >= 0 && x < 25 && y >= 0 && y < 25) {
           report = Fire(x, y, ocean);
           if (report == "HIT") {
               ocean[x][y] = 'H';
           }
           cout << report << endl;
       }
       else if (!cin.fail() && x < 0 || y < 0) {
           cout << "Would you like to exit? (Y/N)" << endl;
           cin >> exiter;

           // Secret function to view current game status
           if (exiter == 'P') {
               for (int i = 0; i < 25; i++) {
                   for (int j = 0; j < 25; j++) {
                       cout << ocean[i][j];
                   }
                   cout << endl;
               }
           }
       }
       else {
           cout << "Please enter two coordinates between 0 and 24 separated by a space." << endl;
           cin.clear();
           cin.ignore(256, '\n');
       }
   }

   OceanFile.close();
   system("Pause");
   return 0;
}

string Fire(int x, int y, char ocean[][25]) {
   string report = "MISS";
   char c = ocean[x][y];
   if (c == '#') {
       report = "HIT";
   } else if(c == 'H') {
       report = "HIT AGAIN";
   }

   return report;
}

bool FleetSunk(char ocean[][25]) {

   bool boats = false;

   // Iterate through the ocean looking for ships
   for (int i = 0; i < 25; i++) {
       for (int j = 0; j < 25; j++) {
           // Calculate character offset and check for unsunk ships
           if (char(ocean[i][j]) == '#') {
               boats = true;
           }
       }
   }

   if (!boats) {
       cout << "The fleet was destroyed." << endl;
   }

   return boats;
}