Taking that and compiling it gives me the simple error:
fatal error: iostream.h: No such file or directory
This is self-explanatory. The reason is that
<iostream> doesn’t have an extension, or a
.h equivalent. Change the line to:
Proof that it compiles (not including the following points, but removing things irrelevant to ideone): http://ideone.com/WIDjR
Aside from that:
You don’t need
systemis part of
using namespace std;often does more bad than good. It’s recommended to stick to
mainisn’t the worst place it could be, but nonetheless, not a great habit to get into.
if( number >= 2 && number <= 2 )is a logic error, both in writing and execution. The simpler form would be
if (number == 2), but the correct form, based on your output, would be
if (number != 2), lest every number other than 2 is the right guess.
system ("PAUSE")is bad. You don’t know if
pause.exewill do that, or if it will even exist. Someone could have a
pause.exethat formats their hard drive, and you’d be to blame for executing it. Use a form of
cin.get(), or, if your compiler implements it to clear the input buffer,
cin.sync(); cin.get();for consistent behaviour. Beware that
cin.sync()‘s behaviour is not guaranteed.
Your program should be returning 0 from normal exit. Anything else is taken to mean an error occurred.
return 0;in main is implicit if you don’t specify a return value.