What are the ways to get a string input from user that stops accepting input when the input's length is already 30 without the need to press ENTER or any other keys. Maybe you can show some code?
My first attempt is to use:
The problem is that it still allows unlimited input and when you hit ENTER it only takes the first 30 characters.Code:char string[31]; fgets(string, 31, stdin);
What operating system are you on?
If you are using a windows based operating system, you could make your own loop with the getch() function.
Fact - Beethoven wrote his first symphony in C
Good call. But then how could I detect ENTER or backspace in getch() in conio.h?Originally Posted by Click_here
If you want unbuffered input, you have to use non-standard C:
conio.h, ncurses, or something (like an API), from the operating system.
I can show you how to do it with conio.h, but your compiler needs to support conio.h (and you need to have it of course).
I'm not clear WHY you don't want to require the enter key be hit, to end the user's input? That would be the normal way to stop user input. If the input buffer is overfull, then that can be cleared out easily enough.
You mean all Windows compilers have getch()? I thought it was only 1 - 2% of them...
Definition: Politics -- Latin, from
poly meaning many and
tics meaning blood sucking parasites
-- Tom Smothers
This is a quote from "Expert C Programming: Deep C secrets", page 213 from the section "Getting a Char Without a Carriage Return"
"The C compilers from Microsoft and Borland provide getch() (or getche() to echo the character) to get input character-by-character without waiting for the whole line"
From the MSDN site: The getch() function is compatible with "Win 98, Win Me, Win NT, Win 2000, Win XP"
Fact - Beethoven wrote his first symphony in C
Works with Windows 7, also.
OK, what about this partial list of Windows C/C++ compilers?
Do they all have conio.h? Yes, some do. But how many?Code:AMPC Bloodshed Dev-C++ Borland C++ C++ Builder C++ Compiler CCS C Compiler Ch CINT Clang CodeWarrior Comeau C/C++ CoSy compiler development system CParser/libFirm Digital Mars Dignus Systems/C DMS Software Reengineering Toolkit EDGE ARM C/C++ GCC IAR C/C++ Compilers Intel C++ Compiler Interactive C LabWindows/CVI Lattice C LCC Mark Williams C Microtec MikroC Compiler MULTI Open Watcom Pelles C PGCC/PGCPP Portable C Compiler QuickC RCC (RCOR C Compiler) RealView C/C++ Compiler (armcc) Ritchie C Compiler (PDP-11) Salford C++ Compiler SAS/C/C++ Small Device C Compiler Small-C Systems/C,C++ Tiny C Compiler Turbo C Turbo C++ Explorer VBCC VectorC Visual C++ VisualAge C++ Wind River (Diab) Compiler
Definition: Politics -- Latin, from
poly meaning many and
tics meaning blood sucking parasites
-- Tom Smothers
I can only speak for "CCS C Compiler"
That is a non-ANSI PIC microprocessor programmer that I use all the time.
And it does have getch() for streams like USART.
Where did you get the 1% from?
Fact - Beethoven wrote his first symphony in C
If they are "Windows" compilers, then presumably they all have it. Why wouldn't they? It's up to you to find a "Windows" compiler that doesn't support it.
The cost of software maintenance increases with the square of the programmer's creativity. - Robert D. Bliss
O_o
Okay.
Well, "Ritchie C Compiler" is not a "Windows" compiler.
Many of those are not "Windows" compilers.
Actually, not even every compiler on that list has support for the "stdio.h" header.
Suggesting alternatives is fine, but you aren't doing that; you are attacking a point that has not been made.
So, I'm curious, what exactly do you recommend?
Don't forget, by your own standard every "Windows" compiler must support any suggestion you make!
Soma
Why would they have it? Simply because Lattice C started it, then M$ and Borland picked it up? If the compiler designers wrote to the standard, why would they have conio.h?
What the heck does O_o mean anyway?
All those compilers have Windows versions, including Ritchie. I removed all compilers from the original list that has no Windows versions.
There are no alternatives, officially. The statement I take exception with is "all Windows C compilers implemented conio.h."
I recommend not stating "all Windows C compilers implemented conio.h" unless it's true. If the compiler in use does, fine. But conio.h is not a Windows-required header.
And,
Do you really need to be obnoxious with the text enhancements?
Definition: Politics -- Latin, from
poly meaning many and
tics meaning blood sucking parasites
-- Tom Smothers
I do know enough about different C compilers for Windows - So I'm happy to learn more.
Could you point out compilers that are for making c programs on Windows and do not have the getch() option?
Fact - Beethoven wrote his first symphony in C
O_oAll those compilers have Windows versions, including Ritchie. I removed all compilers from the original list that has no Windows versions.
If you don't know the difference between targeting a system and running on a system you shouldn't be talking about this at all.
Even when a compiler doesn't come with the "conio" library you can easily add support by using an implementation from a different vendor.The statement I take exception with is "all Windows C compilers implemented conio.h."
If a compiler has the set of headers and libraries available that are required to do WIN32API programming, "conio.h" support is available by definition as there are free implementations available.I recommend not stating "all Windows C compilers implemented conio.h" unless it's true.
The "Windows" headers themselves are not a requirement.But conio.h is not a Windows-required header.
^_^Do you really need to be obnoxious with the text enhancements?
Do you?
Soma
