C++ class, Week 4 - BlitzCoder.net

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Socoder -> C/C++/C#/Other -> C++ class, Week 4
Sat, 17 Oct 2009, 07:51
Afr0	In this week's official class we've reached Chapter 4, which is about structuring your code with functions. Challenges 1. Write a function that multiplies two numbers and returns the result. 2. Change the function you wrote in Challenge 1 so that it remembers how many times you called it. 3. What's the difference between a global variable and a static variable? Which is better in which situation and why? 4. Try rewriting the 'The Cave Adventure Game' so that it does not use functions (an excersize to convince you how useful functions are). 5. Buy a Slurpee. -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Sat, 17 Oct 2009, 08:50
Afr0	// The Snail Race.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <ctime> #include <iostream> using std::cout; using std::cin; //Function declarations int Race(int, int); void Race(void); int Menu(void); int PlaceBet(int); void Init(void); //Variables int Money = 200; int _tmain(int argc, _TCHAR* argv[]) { Init(); int UserResponse; cout << "Welcome to the snail races!" << std::endl; while(UserResponse = Menu()) { switch(UserResponse) { case 1: case 2: case 3: ::Money += Race(PlaceBet(UserResponse), UserResponse); break; case 4: //The user didn't bet. Race(); break; } } return 0; } //Displays the main menu and returns the user's selection int Menu(void) { int UserResponse = -1; cout << "You have " << Money << " dollars." << std::endl; do { cout << "Races Menu\n" << "1. Bet on snail 1\n" << "2. Bet on snail 2\n" << "3. Bet on snail 3\n" << "4. Just watch\n" << "0. Leave races\n"; cin >> UserResponse; } while(UserResponse < 0 && UserResponse > 4); return UserResponse; } //Decides how much a person will bet on a snail int PlaceBet(int UserResponse) { int BetAmount; cout << "Snail " << UserResponse << " is a good choice!\n"; cout << "How much would you like to bet on your snail " << UserResponse << "? "; cin >> BetAmount; return BetAmount; } //If a player is just watching the race void Race(void) { Race(0, 0); } //If a player is betting money int Race(int Money, int UserResponse) { int Winner = rand() % 3 + 1; cout << "And the snails are off!\n" << "Look at them GO!\n" << "The winner is snail " << Winner << std::endl; if(Winner == UserResponse) { cout << "You win!\n"; return 2 * Money; } cout << "You lose " << Money << "dollars.\n"; return -1 * Money; } //Handles program initialization void Init(void) { using std::srand; using std::time; srand(time(0)); } --v -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Sun, 18 Oct 2009, 12:56
Afr0	1. long Multiply(int A, int B) { return A * B; } --v 2. //Will return the number of times it's been called //if both parameters are equal to 0. long Multiply(int A, int B) { static unsigned long long NumTimesCalled = 0; //Just in case... NumTimesCalled++; if(A == 0 && B == 0) return NumTimesCalled; else return A * B; } --v 3. Global variables have file scope, static variables have/can have code block scope. Both kinds persists throughout the entire execution of the program. 4. To Be Continiued -=-=- Afr0 Games Project Dollhouse on Github - Please fork!