Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 4 Exercise 10
Using std_lib_facilities.h by Bjarne Stroustrup.
[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP
// Chapter 4 Exercise 10
#include "std_lib_facilities.h"
int main()
try
{
int rndNum;
string illegalRndInput;
string moveCheck = "noCorrectMove";
string exit;
string yourMove;
int computerMoveIndex;
bool again = true;
vector<string> Move;
Move.push_back("Rock");
Move.push_back("Paper");
Move.push_back("Scissors");
while (again == true) {
cout << "Enter a random integer to calculate the computers next move: \n";
while(cin){
if (cin >> rndNum) {
computerMoveIndex = rndNum % 3;
break;
}
else {
cin.clear();
cin >> illegalRndInput;
error("Illegal input for random integer: ", illegalRndInput);
}
}
cout << computerMoveIndex << "\n";
cin.clear();
cout << "Enter your own move: Rock, Paper or Scissors: \n";
if (cin >> yourMove) {
for (int i = 0; i < Move.size(); i++) {
if (Move[i] == yourMove) {
moveCheck = "moveCorrect";
cout << "Your move: " << yourMove << "\n";
cout << "Computer move: " << Move[computerMoveIndex] << "\n";
switch (i) {
case 0:
if (computerMoveIndex == 0) {
cout << "Its a tie!\n";
}
else if (computerMoveIndex == 1) {
cout << "Computer wins!\n";
}
else if (computerMoveIndex == 2) {
cout << "You win!\n";
}
break;
case 1:
if (computerMoveIndex == 0) {
cout << "You win!\n";
}
else if (computerMoveIndex == 1) {
cout << "Its a tie!\n";
}
else if (computerMoveIndex == 2) {
cout << "Computer wins!\n";
}
break;
case 2:
if (computerMoveIndex == 0) {
cout << "Computer wins!\n";
}
else if (computerMoveIndex == 1) {
cout << "You win!\n";
}
else if (computerMoveIndex == 2) {
cout << "Its a tie!\n";
}
break;
}
}
}
if (moveCheck != "moveCorrect"){
error("Illegal input for your move: ", yourMove);
}
}
cout << "Play again? y for yes n for no: \n";
string answer;
cin >> answer;
if (answer == "n") {
break;
}
}
keep_window_open(".");
}
catch (runtime_error e) {
cout << e.what() << "\n";
keep_window_open(".");
}
catch (…) {
cout << "exiting\n";
keep_window_open(".");
}
[/code]
Output: Enter a random integer to calculate the computers next move: 130 1 Enter your own move: Rock, Paper or Scissors: Paper Your move: Paper Computer move: Paper Its a tie! Play again? y for yes n for no:
