Originally Posted by ikix

Hi, first post :cheesy:

I'm currently a complete noob to c++ programming and am currently reading the book "Beginning C++ Game Programming" written by Michael Dawson. I had the problem where i complied and ran the following source code:

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#include <iostream>
 
int main()
 
{
std::cout << "Game Over!";
std::cin.ignore(std::cin.rdbuf()->in_avail() + 1);
return 0;
}

#include <iostream> int main() { std::cout << "Game Over!"; std::cin.ignore(std::cin.rdbuf()->in_avail() + 1); return 0; }

This would pop up with a window and it would then very quickly dissapear, in the book it says that this might happen and says to use the following code just before the

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return 0;

return 0;

bit:

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std::cin.ignore(std::cin.rdbuf()->in_avail() + 1 )

std::cin.ignore(std::cin.rdbuf()->in_avail() + 1 )

This then ofcourse worked and i have to press enter to close the window that pops up (you'll see why i have written this later).

I then moved a tiny bit further into the book and used the following code:

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#include <iostream>
 
using namespace std;
 
int main()
{
int score; 
double distance; 
char playAgain; 
short lives, aliensKilled;
 
score = 0;
distance = 1200.76;
playAgain = 'y';
lives = 3;
aliensKilled = 10;
 
double engineTemp = 6572.89;
cout << "\nscore: " << score << endl;
cout << "distance: " << distance << endl;
cout << "playAgain: " << playAgain << endl;
cout << "lives: " << lives << endl;
cout << "aliensKilled: "<< aliensKilled << endl;
cout << "engineTemp: " << engineTemp << endl;
 
int fuel;
cout << "\nHow much fuel? ";
cin >> fuel;
cout << "fuel: " << fuel << endl;
 
typedef unsigned short int ushort;
ushort bonus = 10;
cout << "\nbonus: " << bonus << endl;
return 0;
}

#include <iostream> using namespace std; int main() { int score; double distance; char playAgain; short lives, aliensKilled; score = 0; distance = 1200.76; playAgain = 'y'; lives = 3; aliensKilled = 10; double engineTemp = 6572.89; cout << "\nscore: " << score << endl; cout << "distance: " << distance << endl; cout << "playAgain: " << playAgain << endl; cout << "lives: " << lives << endl; cout << "aliensKilled: "<< aliensKilled << endl; cout << "engineTemp: " << engineTemp << endl; int fuel; cout << "\nHow much fuel? "; cin >> fuel; cout << "fuel: " << fuel << endl; typedef unsigned short int ushort; ushort bonus = 10; cout << "\nbonus: " << bonus << endl; return 0; }

The problem with this one is that at the red highlighted bit the user is meant to input a number into the window and press enter. I have read on this forum that you can use the following code to get around the problem:

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std::cin.ignore(std::cin.rdbuf()->in_avail() + 2 )

std::cin.ignore(std::cin.rdbuf()->in_avail() + 2 )

Lo and behold it works aswell.

Now onto the real question :rolleyes:

The two following bits of source:

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std::cin.ignore(std::cin.rdbuf()->in_avail() + 1 )
std::cin.ignore(std::cin.rdbuf()->in_avail() + 2 )

std::cin.ignore(std::cin.rdbuf()->in_avail() + 1 ) std::cin.ignore(std::cin.rdbuf()->in_avail() + 2 )

I have no idea what the things in them are for and how the hell it is solving the problem for me, as i have read (again on this forum) it isn't exactly good practice to wack in code and just remember not to mess up again in the future. So i was therefore wandering if you lot could tell me what the things in this mean and do so that they solve the problem so that i can use the code with actually knowing what it is doing. Considering I'm a complete noob and won't understand any real techincal jargon yet (read the book for about 3 hours now and only 20 pages in :lol: ) can you explain it in a way that even George Bush could understand. Cheers :cheesy:

IDE = Dev-C++ LINKY

Originally Posted by jbennet

yes i just do

using namespace std

then im like

cout << "Hello";
cin >> variablex;

Originally Posted by jbennet

yes i just do

using namespace std

then im like

cout << "Hello";
cin >> variablex;

Originally Posted by jbennet

? simple terms please

Originally Posted by joeprogrammer

>So, next time you call "cin >> variable", it will reach the left over ENTER chacter and continue, not allowing any input.
Not quite. cin actually keeps searching/waiting until it finds data. This behaviour is fine until you start using getline() [edit] or until the user types in more data than one variable [/edit], which simply stops when it finds a newline character. That is why the input buffer must be flushed when mixing cin >> and getline.