conio.h is a C header file used mostly by MS-DOS compilers to provide console input/output.[1] It is not part of the C standard library or ISO C, nor it is defined by POSIX.
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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, DOSX, OS/2, or Win32[2] 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 or cc65 use a conio-compatible library.[3]
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 DOSINT 21H functions. 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. This library also has additional functions inspired from the successful Turbo Pascal one.
Compilers that target non-DOS operating systems, such as Linux or OS/2, provide similar solutions; the unix-related curses library is very common here. Another example is SyncTERM's ciolib. The version of conio.h done by DJ Delorie for the GO32 extender is particularly extensive.[4]
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Member functions[edit]
The BOSS Library consists of a wrapper around SDL (Simple DirectMedia Layer) that imitates interfaces of older libraries such as Borland Graphics Interface (BGI), conio.h, bios.h. The goal is to be able to port old applications to modern systems.
kbhit | Determines if a keyboard key was pressed |
cgets | Reads a string directly from the console |
cscanf | Reads formatted values directly from the console |
putch | Writes a character directly to the console |
cputs | Writes a string directly to the console |
cprintf | Formats values and writes them directly to the console |
clrscr | Clears the screen |
getch | Get char entry from the console |
References[edit]
- ^Schildt, Herbert (1995). C: The Complete Reference (3rd ed.). Berkeley, Calif.: Osborne McGraw-Hill. p. 288. ISBN0-07-882101-0.
For DOS-compatible compilers, the direct console I/O functions generally use the CONIO.H header file.
- ^'Console and Port I/O in MSDN'.
- ^'MicroVGA conio Text User Interface Library'.
- ^'DJGPP C Library Reference – conio'.
External links[edit]
- IO FAQ - explanation and suggestions for non-standard console IO
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Conio.h&oldid=941069588'
greetings everyone!!!
its a fact that on xcode one don't have conio.h file instead curses.h can be used for using function like getch(). i did the same but my output is totally different
here is the program#include <stdio.h>
#include <ctype.h>
#include<curses.h>
int main()
{
char ch;
do{
ch=getch();
if(islower(ch))
ch=toupper(ch);
else
ch=tolower(ch);
putchar(ch);
}while(ch!='.');
return 0;
}
it is suppose to convert uppercase letter to lowercase and vice-versa.
if i use getchar it works fine but on using getch() output is infinite loop.
can anyone tell why this infinite loop is coming