This is just a sample code that compiles using the Microsoft C compiler but seems to be giving problems when compiled in Dev-C. The problem is that I am trying to port a library to Dev-C but this kind of functionality has been used in the library and I am getting all sorts or wierd errors because of this. Mar 15, 2018 In this article, we are going to learn about the textbackground and textcolor functions of conio.h header file and use them to change colors. Submitted by Manu Jemini, on March 15, 2018. These are very helpful functions to change the color or the background of the text. Jul 06, 2002 Hi, i'm a C leaner. I want to generate graphics in DOS with Dev-C. It can be simple graphics. No rendering or hardware stuff. Like drawing cirlces, squares, triangles.
Print formatted data to a stream. More secure versions of these functions are available; see fprintf_s, _fprintf_s_l, fwprintf_s, _fwprintf_s_l.
Those listed here are supported by the latest C and C standards (both published in 2011), but those in yellow were introduced in C99 (only required for C implementations since C11), and may not be supported by libraries that comply with older standards. See also puts Write string to stdout (function ).
Syntax
Parameters
stream
Pointer to FILE structure.
format
Format-control string.
argument
Optional arguments.
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Printf In Dev C++
locale
The locale to use.
Return Value
fprintf returns the number of bytes written. fwprintf returns the number of wide characters written. Each of these functions returns a negative value instead when an output error occurs. If stream or format is NULL, these functions invoke the invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, the functions return -1 and set errno to EINVAL. The format string is not checked for valid formatting characters as it is when using fprintf_s or fwprintf_s.
See _doserrno, errno, _sys_errlist, and _sys_nerr for more information on these, and other, error codes.
Remarks
fprintf formats and prints a series of characters and values to the output stream. Each function argument (if any) is converted and output according to the corresponding format specification in format. For fprintf, the format argument has the same syntax and use that it has in printf.
fwprintf is a wide-character version of fprintf; in fwprintf, format is a wide-character string. These functions behave identically if the stream is opened in ANSI mode. fprintf does not currently support output into a UNICODE stream.
The versions of these functions with the _l suffix are identical except that they use the locale parameter passed in instead of the current thread locale.
Important
Ensure that format is not a user-defined string.
Generic-Text Routine Mappings
| TCHAR.H routine | _UNICODE & _MBCS not defined | _MBCS defined | _UNICODE defined |
|---|---|---|---|
| _ftprintf | fprintf | fprintf | fwprintf |
| _ftprintf_l | _fprintf_l | _fprintf_l | _fwprintf_l |
For more information, see Format Specifications.
Requirements
Printf In Dev C++
| Function | Required header |
|---|---|
| fprintf, _fprintf_l | <stdio.h> |
| fwprintf, _fwprintf_l | <stdio.h> or <wchar.h> |
For additional compatibility information, see Compatibility.
Example
See also
Stream I/O
_cprintf, _cprintf_l, _cwprintf, _cwprintf_l
fscanf, _fscanf_l, fwscanf, _fwscanf_l
sprintf, _sprintf_l, swprintf, _swprintf_l, __swprintf_l
Format Specification Syntax: printf and wprintf Functions
conio.h is a C (programming language) C header file used in old MS-DOS compilers to create text user interfaces. It is not described in The C Programming Language (book) The C Programming Language book, and it is not part of the C standard library, ISO C nor is it required by POSIX.
This header declares several useful library functions for performing 'console input and output' from a program. Most C compilers that target DOS, Windows 3.x, Phar Lap (company) Phar Lap, DOSX, OS/2, or Win32[1] have this header and supply the associated library functions in the default C library. Most C compilers that target UNIX and Linux do not have this header and do not supply the library functions. Some embedded systems are using a conio-compatible library [2].
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The library functions declared by conio.h vary somewhat from compiler to compiler. As originally implemented in Lattice C, the various functions mapped directly to the first few DOS int 21h functions. But the library supplied with Borland's Turbo C did not use the DOS API but instead accessed video RAM directly for output and used BIOS interrupt calls; they also have additional functions inspired on the successful Turbo Pascal library.
Compilers that targeted non-DOS operating systems, such as Linux[citation needed], Win32 and OS/2, provided different implementations of these functions.[citation needed] The version done by DJ Delorie for the DJGPP GO32 extender is particularly extensive[3]. Another example is SyncTERM#Libraries SyncTERM's ciolib.
lpc
| int kbhit(void) | Determines if a keyboard key was pressed. |
| int getch(void) | Reads a character directly from the console without buffer, and without echo. |
| int getche(void) | Reads a character directly from the console without buffer, but with echo. |
| int ungetch(int c) | Puts the character c back into the keyboard buffer. |
| char *cgets(char *buffer) | Reads a string directly from the console. |
| int cscanf(char *format, arg0,.. argn) | Reads formatted values directly from the console. |
| int putch(int c) | Writes a character directly to the console. |
| int cputs(const char *string) | Writes a string directly to the console. |
| int cprintf(const char *format, arg0,.. argn) | Formats values and writes them directly to the console. |
Compilers provided later than 1989 have prepended an _ to the names, to comply with the requisites of the ANSI C Standard.
External links[edit]
- IO FAQ - explanation and suggestions for non-standard console IO
References[edit]
- ↑'Console and Port I/O in MSDN'. http://msdn.microsoft.com/en-us/library/7x2hy4cx(VS.71).aspx.
- ↑'MicroVGA conio Text User Interface Library'. http://www.microvga.com/conio-lib.
- ↑'DJGPP C Library Reference - conio'. http://www.delorie.com/djgpp/doc/libc/libc_4.html.