Question

Need to design a program in C++ that plays hangman using classes (polymorphism and inheritance)

Below is the code only need to add the classes and make the program run with at least one class of Polymorphism and Inheritance.

CODE:

#include <iostream>

#include <cstdlib>

#include<ctime>

#include <string>

using namespace std;

int NUM_TRY=8; //A classic Hangman game has 8 tries. You can change if you want.

int checkGuess (char, string, string&); //function to check the guessed letter

void main_menu();

string message = "Play!"; //it will always display

int main(int argc, char *argv[])

{

string name;

char letter;

string word;

  

string words[] = //These are the list of 10 three lettered words.

{ //You can change them as per your requirement.

"man",

"van",

"tan",

"hop",

"pop",

"two",

"six",

"may",

"low",

"out",

};

  

srand(time(NULL));

int n=rand()% 10; //Random function to genterate random words from the given list

word=words[n];

  

  

string hide_m(word.length(),'X'); // This function is used to hide the actuall word to be guessed.

//The mask selected is 'X' so the word will show as 'XXX' till you guess the correct letters.

  

  

  

while (NUM_TRY!=0)

{

main_menu();

cout << "\n" << hide_m;

cout << "\nGuess a letter: ";

cin >> letter;

  

if (checkGuess(letter, word, hide_m)==0)

{

message = "Wrong letter.";

NUM_TRY = NUM_TRY - 1;

}

else

{

message = "NICE! You guessed a letter";

}

if (word==hide_m)

{

message = "Congratulations! You got it!";

main_menu();

cout << "\nThe word is : " << word << endl;

break;

}

}

if(NUM_TRY == 0)

{

message = "NOOOOOOO!...you've been hanged.";

main_menu();

cout << "\nThe word was : " << word << endl;

}

cin.ignore();// used to discard everything in the input stream

cin.get();

return 0;

}

int checkGuess (char guess, string secretword, string &guessword)

{

int i;

int matches=0;

int len=secretword.length();

for (i = 0; i< len; i++)

{

  

if (guess == guessword[i])

return 0;

  

if (guess == secretword[i])

{

guessword[i] = guess;

matches++;

}

}

return matches;

}

void main_menu()

{

system("cls");

cout<<"\nHangman Game!";

cout << "\nYou have " << NUM_TRY << " tries to try and guess the word.";

cout<<"\n"+message;

}

//*end of code*

Hangman Game

*** Need at least to add one Class to the game code that uses Polymorphism and Inheritance.

Answer 1

/* Below is the modified program of yours with added feature of polymorphism and inheritance. Polymorphism because the function checkGuess () is overloaded because it is declared in base as well as derived class and inheritance is used because a base class is derived in derive class */

#include <iostream>
#include <cstdlib>
#include<ctime>
#include <string>
using namespace std;
class Base {
public:
int checkGuess (){}
int NUM_TRY=8;
string message = "Play!";
};   
class Derived: public Base //inheritance
{
public:
int checkGuess (char guess, string secretword, string &guessword) // polymorphism
{
int i;
int matches=0;
int len=secretword.length();
for (i = 0; i< len; i++)
{
  
if (guess == guessword[i])
return 0;
  
if (guess == secretword[i])
{
guessword[i] = guess;
matches++;
}
}
return matches;
}
void main_menu(int NUM_TRY,string message)
{
cout<<"\nHangman Game!";
cout << "\nYou have " << NUM_TRY << " tries to try and guess the word.";
cout<<"\n"+message;
}
};

int checkGuess (char guess, string secretword, string &guessword)
{
int i;
int matches=0;
int len=secretword.length();
for (i = 0; i< len; i++)
{
  
if (guess == guessword[i])
return 0;
  
if (guess == secretword[i])
{
guessword[i] = guess;
matches++;
}
}
return matches;
}
int main()
{string name;
char letter;
string word;
Derived d=Derived();
string words[] = //These are the list of 10 three lettered words.
{ //You can change them as per your requirement.
"man",
"van",
"tan",
"hop",
"pop",
"two",
"six",
"may",
"low",
"out",
};
  
srand(time(NULL));
int n=rand()% 10; //Random function to genterate random words from the given list
word=words[n];
  
  
string hide_m(word.length(),'X');
while (d.NUM_TRY!=0)
{
d.main_menu(d.NUM_TRY,d.message);
cout << "\n" << hide_m;
cout << "\nGuess a letter: ";
cin >> letter;
  
if (d.checkGuess(letter, word, hide_m)==0)
{
d.message = "Wrong letter.";
d.NUM_TRY = d.NUM_TRY - 1;
}
else
{
d.message = "NICE! You guessed a letter";
}
if (word==hide_m)
{
d.message = "Congratulations! You got it!";
cout << "\nThe word is : " << word << endl;
break;
}
}
if(d.NUM_TRY == 0)
{
d.message = "NOOOOOOO!...you've been hanged.";
d.main_menu(d.NUM_TRY,d.message);
cout << "\nThe word was : " << word << endl;
}
cin.ignore();// used to discard everything in the input stream
cin.get();
return 0;
}