Thread: debuging problem

That discards at most 128 unread characters from the input stream up to and including the first newline. (If you are entering input from the console, there probably can't be unread characters beyond the first newline.)

Originally Posted by vampirekid.13

you will notice i made your for loops that had a cin >> have a full code block and added cin.get() after each one, then i also added a cin.get(); right before the return 0;


that was the problem, the code wasn't crashing, there just was nothing left to execute and keep the console open. therefor terminating the process.

Your analysis is on the right track, but your solution is not particularly good. The indiscriminate use of std::cin.get() is unnecessary at many points. Where it is necessary (and it is not necessary in this program), it would be better to use std::cin.ignore() instead (possibly supplying the number of characters to ignore), or the std::ws manipulator.

As a way to prevent the closing of the console window, it is a poor man's solution compared to what matsp, anon and JVene have suggested.

EDIT:

Originally Posted by anon

Before all these cin.get()s one should put a cin.ignore()

That would be wrong, since it means that if a user enters the numbers all on a single line, only the first number will be read, unless enough numbers were added to be beyond 128 characters in length.

the other thing is right before return 0; do another cin.get(); to keep the console up. if it still closes add another cin.get(); before return 0;

I meant these. Naturally don't empty the buffer if you don't want it to be empty.

Code:

//not the right way
cin.get();
cin.get();
cin.get();
return 0;

i still dont fully understand how cin.ignore works.

what if someone inputs 10 chars with spaces between them instead of pressing enter?

cin.ignore empties the stream so that those characters are not there anymore. Without that following input functions like cin >>, cin.get, getline etc keep reading those characters as each of them should without pausing for further input until there is nothing left to read.

also, in VC++ the console closes after printing the output w/o having a system("pause"); or cin.get(); before return 0;

I think a shortcut was already mentioned (Ctrl + F5?).

Those artificial means to keep windows open are just a crutch. It is important to know about cin.ignore though.