/* My first 1 player game! Rules are simple: Enter a starting number. On each turn, player subtracts one or two from the total. Whoever subtracts final amount to reduce total to zero wins. Uses: while loops, if else, user input, wrong input error, cmath, break disallows entering nonpositive integer play again feature */ #include #include using namespace std; int main() { int x; int guess = 1; char play = 'y'; cout << "Welcome to NIM. " << endl << endl; cout << "Here are the rules: \n"; cout << "Enter a number. Then subtract either one or two from the total on each turn. "; cout << "Whoever removes the final amount to get to zero first wins." << endl; cout << "Think you can beat me? " << endl << endl; while (play == 'y') { cout << "Enter a number to start: "; cin >> x; while (x <= 0) { cout << "x must be a positive integer.\n"; cout << "Enter a number to start: "; cin >> x; } while (x > 0) { if (x%3 == 2) { x = x-2; cout << "X is now: " << x << ".\n"; } else { --x; cout << "X is now: " << x << ".\n"; } if (x == 0) { cout << "Can't beat me this time. I win!\n"; break; } else { cout << "Your turn." << endl; } cout << "Subtract 1 or 2 from the total: "; cin >> guess; while (guess != 1 && guess != 2) { cout << "You can only subtract 1 or 2. \nEnter a guess: "; cin >> guess; } /*if (guess == 2) { x = x-2; cout << "X is now: " << x << ".\n"; } else { --x; cout << "X is now: " << x << ".\n"; } */ //more efficient: x = x - guess; cout << "X is now: " << x << ".\n"; if (x == 0) { cout << "You got me; you win!\n"; break; } else { cout << "My turn." << endl; } } cout << "Want to play again? (Enter y or n): "; cin >> play; while (play != 'y' && play != 'n') { cout << "Please enter y or n only: "; cin >> play; } } return 0; }

***NIM (Subtraction Game) (Successful)