Why need two cin.get() ???

Hello everyone,

I write below programming exercise but, why i need to write two time cin.get () at the end in order to "hold" the screen??? If i just wrote one cin.get (), I found the progamme automatically close the screen after run the programme.

I am using DEV++, will it be a reason? Thank you.


// Programme to read and print the absolute value //

#include <iostream>
using namespace std;

int main ()
{
int value;

cout << " Please enter a integer : ";
cin >> value;
if( value < 0 )
value = -value;
cout << " The absolute value of the integer is :" << value <<endl;
cin.get();
cin.get();

return 0;
}

This is because of a keyboard buffer error. When you press <Enter>, all the keys you just entered get flushed through to the program, but the newline itself rarely does, thus the next time you request input there is only a single newline in the buffer so it automatically reads that in and, since it's a newline, terminates the stream right there.

Thus, your first cin.get() is just reading in the leftover newline from your first cin>>, and the second cin.get() is actually pausing the program.

Thanks B-con,

So, what should i suppose to do in order to de-bug it??

Thank you very much.

To fix the problem of using two cin.get()'s, I personally use the line "fseek(stdin,0L,SET_END)" before every string (or individual character) I read in, that will clear the buffer of any residue from previous inputs.

ie: