If else problem

**darkfaust** · 05-19-2008

I am using a book called "C++: A Dialogue" in order to learn the language. I am stuck on the following code:

Code:

#include <iostream>
using namespace std;
int main()
{
short balance;
cout << "Please enter your bank balance: ";
cin >> balance;
if (balance < 10000)
cout << "Please remit $20 service charge." << endl;
else
cout << "Have a nice day!" << endl;
return 0;
}

I cannot get the compiled program to go beyond input after it says "please enter your bank balance". After I imput a number and press enter, the program simply closes. Can anyone tell me what I am doing wrong?

**medievalelks** · 05-19-2008

It works for me with MinGW/GCC 3.4.5. What compiler are you using?

**darkfaust** · 05-19-2008

I am using Bloodshed Dev-C++ 4.9.9.2.

**robwhit** · 05-19-2008

http://faq.cprogramming.com/cgi-bin/...&id=1043284385

**darkfaust** · 05-19-2008

I tried using

Code:

cin.get();

in order to keep it open, but it still did not work for me.

**hk_mp5kpdw** · 05-19-2008

Originally Posted by darkfaust

I tried using

Code:

cin.get();

in order to keep it open, but it still did not work for me.

Put in a second one. After you type enter after entering the balance, the newline character is left in the input stream. The first cin.get() will read that one and the program will then keep going... which means it still ends. So, put in a second one right after the first and that one will block/wait for input.

**darkfaust** · 05-19-2008

Thanks hk_mp5kpdw, that solved the problem. Thanks to everyone for the help.

**Elysia** · 05-20-2008

You could try indenting a bit better, you know... Surely, the book's code itself must be indented.

**swgh** · 05-20-2008

another way

Code:

std::cin.get();
std::cin.ignore();

**laserlight** · 05-20-2008

another way

Actually, those statements should be swapped.

**anon** · 05-20-2008

Actually, the FAQ might show more "correct" ways: there is no guarantee that only one character is left in cin (e.g user might type "102 lalalalala").

Or simply make it a habit to run the program from a command window (where such code to keep the window "open" only becomes an annoyance).

**Elysia** · 05-20-2008

Or set a breakpoint at the end of the program and run in debug mode or use a special run such as Visual Studio's Ctrl+F5.
There are many ways... Running from the command line is not what everyone might like or understand.

But otherwise, the STL has functions to eat whitespace. So eating all whitespace and then doing cin.get() should cause the prompt to pause.

**dudeomanodude** · 05-20-2008

I always prefer my writing my own pausing mechanism like:

Code:

std::cout << "Press [Enter] to continue...";
std::cin.ignore( 256, '\n' );

Though due to the stream buffer you might have to hit enter twice, but it's better than system("open the gates of h3ll!");

**MarkZWEERS** · 05-20-2008

aaaahhh people, just work with Linux! no disappearing output screens, no breakpoints, no ignores or whatsoever, just a nice, fail proof, wysiRwyg*, terminal....

* what you see is REALLY what you get

**matsp** · 05-20-2008

Originally Posted by MarkZWEERS

aaaahhh people, just work with Linux! no disappearing output screens, no breakpoints, no ignores or whatsoever, just a nice, fail proof, wysiRwyg*, terminal....

* what you see is REALLY what you get

Actually, if you run a console program from an IDE in Linux, I'm pretty sure it disappears too [assuming the IDE doesn't perform some "magic" to prevent that]. Which turns your argument into "just use command line" - which is far enough except modern programmers don't know how... ;-)

--
Mats

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