Question

Write a C++ game that plays Craps. Craps is a game played with a pair of dice. The shooter (the player with the dice) rolls a pair of dice and the number of spots showing on the two upward faces are added up. If the opening roll (called the ‘come out roll’) is a 7 or 11, the shooter wins the game. If the opening roll results in a 2 (snake eyes), 3 or 12 (box cars), the shooter loses, otherwise known as ‘crapping out’. If the shooter rolls a 4, 5, 6, 8, 9 or 10 on the opening roll, then they must roll the same number before rolling a 7 to win the game.

Example:

If the shooter rolls a 6 on the come out roll, a 10 on the second roll and a 7 on the third roll, the shooter loses since he rolled a 7 before rolling another 6. If, however, he rolled a 6 on the third roll, he wins the game.

• Your program should first ask the user if they want to play craps.

1. If they respond with ‘Y’ or ‘y’ then go to step 2.

2. If they respond with ‘N’ or ‘n’ and they played one or more games then display the number of wins, losses and the winning percentage (xx.x%). If they didn’t play any games then the program should terminate.

3. If they responded with something besides ‘y’, ‘Y’, ‘n’, or ‘N’ then your program should display a message letting them know that their input was an invalid response and re-prompt them if they want to play craps and the program should go back to step 1.

• You must use cin to a char variable to get their response.

• Randomly generate two numbers from 1 to 6 that will be used represent each die.

• Display each die’s value and the sum of the two dice in the following format (Your format must match the format below):

X : Y = SUM

          Where X is the first die, Y is the second die and SUM is the sum of two dice.

• After each “roll of the dice”, if the shooter wins or losses, then your program must display an appropriate message. Otherwise, your program should display “Please roll again”. The user should press enter to roll again.  Your program must use the getline function to read the input (enter key) from the user.

• After the game is over, your program should prompt the user if they want to play another game of craps.

• All non constant variables must have the minimum scope required.

• You must use the following in your program:

 

1. At least one do while OR while

2. At least one switch

3. At least one if elseif

Answer 1

#include <iostream>

#include <iomanip>

using namespace std;

int main()

{

  //setting srand so that random numbers generated are not same each time

  srand(time(NULL));

  char c;

  //n to store number or games played

  int n=0;

  //w to store number of games won by player

  int w=0;

  while(true){

    //asking if user wants to play

    cout<<"Do you want to play craps [Y/N]:";

    cin>>c;

    //if user enters n then breaking out of loop

    if(c=='N'||c=='n')

      break;

    //using switch to check input

    switch(c){

      case 'Y':

      case 'y':

        {

          int s=0;

          //incrementing number of game played by user

          n++;

          do{

            //generating 2 random number

            int a=rand() % 6 + 1;

            int b=rand() % 6 + 1;

            int sum=a+b;

            cout<<a<<" : "<<b<<" = "<<sum<<endl;

            //checking if in first roll sum equals to 7 or 11

            if(s==0&&(sum==7||sum==11)){

              w++;

              cout<<"You Win!!"<<endl;

              break;

            }

            //checking if in first roll sum equals to 2, 3 or 11

            else if(s==0&&(sum==2||sum==3||sum==12)){

              cout<<"You Loose!!"<<endl;

              break;

            }

            else{

              string str;

              //storing the sum of opening roll

              if(s==0){

                getline(cin,str);

                s=sum;

              }

              //if opening rolled sum is rolled again

              //setting s==-1

              else if(s==sum)

                s=-1;

              else{

                //if 7 appears before the opening roll sum is rolled again

                if(sum==7&&s==-1){

                  w++;

                  cout<<"You Win!!"<<endl;

                  break;

                }

                else if(sum==7){

                  cout<<"You Loose!!"<<endl;

                  break;

                }

              }

              cout<<"Please roll again [press Enter]";

              getline(cin,str);

            }

          }while(true);

          break;

        }

      default:

        cout<<"Wrong Answer!!"<<endl;

    }

  }

  //if user played then printing output

  if(n!=0){

    cout<<"\n**************************************"<<endl;

    cout<<"Total number of games played:"<<n<<endl;

    cout<<"Total Number of wins:"<<w<<endl;

    cout<<"Winning percentage:";

    //printing percentage with one decimal value

    cout<<fixed<<setprecision(1)<<w*100.0/n<<"%"<<endl;

    cout<<"**************************************"<<endl;

  }

  return 0;

}