Function name: raise
Function: Send a signal to the program being executed
Usage: int Raise (Int Sig);
Example:
#include
Int main (void)
{
INT A, B;
A = 10;
B = 0;
IF (b == 0)
/ * Preempt divide by Zero Error * /
Raise (SIGFPE);
A = a / b;
Return 0;
}
Function name: Rand
Function: Random number generator
Usage: void rand (void);
Example:
#include
#include
Int main (void)
{
INT I;
Printf ("Ten Random Numbers from 0 to 99 / N / N");
For (i = 0; i <10; i )
Printf ("% D / N", RAND ()% 100);
Return 0;
}
Function name: Randbrd
Function: random block reading
Usage: int RANTBRD (Struct FCB * fcbptr, int RECCNT);
Example:
#include
#include
#include
#include
Int main (void)
{
Char Far * Save_dta;
Char line [80], buffer [256];
Struct FCB BLK;
INT I, RESULT;
/ * GET User Input File Name for DTA * /
Printf ("Enter Drive and File Name (No Path - I.E. A: File.dat) / N");
Gets (line);
/ * PUT FILE Name in FCB * /
IF (! PARSFNM (Line, & BLK, 1))
{
Printf ("ERROR in Call to Parsfnm / N);
Exit (1);
}
Printf ("DRIVE #% D File:% S / N / N", BLK.FCB_DRIVE, BLK.FCB_NAME;
/ * Open file with dos fcb open file * /
BDOSPTR (0x0f, & blk, 0);
/ * SAVE OLD DTA, AND SET New One * /
Save_dta = getdta ();
Setda (buffer);
/ * SET UP INFO for the New DTA * /
BLK.FCB_RECSIZE = 128;
BLK.FCB_Random = 0L;
Result = randbrd (& BLK, 1);
/ * Check Results from randbrd * /
IF (! result)
Printf ("Read OK / N / N");
Else
{
"" ERROR DURING READ ");
Exit (1);
}
/ * Read in data from the New DTA * /
Printf ("The first 128 characters are: / n");
For (i = 0; i <128; i )
Putchar (buffer [i]);
/ * RESTORE PREVIOUS DTA * /
Setdta (Save_DTA); Return 0;
}
Function name: randbwr
Function: random block
Usage: int RANDBWR (struct fcp * fcbptr, int RECCNT);
Example:
#include
#include
#include
#include
Int main (void)
{
Char Far * Save_dta;
Char line [80];
Char buffer [256] = "Randbwr Test!";
Struct FCB BLK;
Int result;
/ * Get new file name from user * /
Printf ("Enter A File Name to Create (No Path - IE. A: File.dat / N");
Gets (line);
/ * Parse the new file name to the dta * /
PARSFNM (Line, & BLK, 1);
Printf ("DRIVE #% D File:% S / N", BLK.FCB_DRIVE, BLK.FCB_NAME;
/ * Request dos Services to create file * /
IF (BDoSPTR (0x16, & BLK, 0) == -1)
{
"" "ERROR CREANG FILE");
Exit (1);
}
/ * Save Old DTA and SET New DTA * /
Save_dta = getdta ();
Setda (buffer);
/ * Write new records * /
BLK.FCB_RECSIZE = 256;
BLK.FCB_Random = 0L;
Result = RANDBWR (& BLK, 1);
IF (! result)
Printf ("Write OK / N");
Else
{
PERROR ("Disk Error");
Exit (1);
}
/ * Request DOS Services to Close THE FILE * /
IF (BDOSPTR (0x10, & BLK, 0) == -1)
{
"" ERROR Closing File ");
Exit (1);
}
/ * RESET the OLD DTA * /
SetDA (Save_DTA);
Return 0;
}
Function name: Random
Function: Random number generator
Usage: int Random (Int Num);
Example:
#include
#include
#include
/ * Prints a Random Number in the Range 0 to 99 * /
Int main (void)
{
Randomize ();
Printf ("Random Number In The 0-99 Range:% D / N", Random (100));
Return 0;
}
Function name: Randomize
Function: Initializing the random number generator
Usage: void randomize (void);
Example:
#include
#include
#include
Int main (void)
{
INT I;
Randomize (); Printf ("Ten Random Numbers from 0 to 99 / N / N");
For (i = 0; i <10; i )
Printf ("% D / N", RAND ()% 100);
Return 0;
}
Function name: Read
Function: read from the file
Usage: int in (int Handle, Void * BUF, INT NBYTE);
Example:
#include
#include
#include
#include
#include
#include
Int main (void)
{
Void * BUF;
INT HANDLE, BYTES;
BUF = Malloc (10);
/ *
Looks for a file in The Current Directory Named Test. $$$ And Attempts
To read 10 bytes from it. To Use this example you shop crete the
File Test. $$$
* /
IF ((Handle =
Open ("Test. $$$", O_RDONLY | O_BINARY, S_IWRITE | S_IREAD) == -1)
{
Printf ("Error Opening File / N);
Exit (1);
}
IF ((bytes = read (Handle, BUF, 10)) == -1) {
Printf ("Read Failed./N");
Exit (1);
}
Else {
Printf ("Read:% D Bytes Read./N", BYTES);
}
Return 0;
}
Function name: Realloc
Finance: Renotes the main memory
Usage: Void * Realloc (Void * PTR, Unsigned Newsize);
Example:
#include
#include
#include
Int main (void)
{
Char * STR;
/ * Allocate Memory for String * /
Str = malloc (10);
/ * Copy "Hello" INTO STRING * /
STRCPY (STR, "Hello");
Printf ("String IS% S / N Address IS% P / N", STR, STR);
Str = Realloc (STR, 20);
Printf ("String IS% S / N New Address IS% P / N", STR, STR);
/ * Free memory * /
Free (STR);
Return 0;
}
Function name: Rectangle
Function: draw a rectangle
Usage: Void Far Rectangle (int LEFT, INT TOP, INT RIGHT, INT BOTTOM);
Example:
#include
#include
#include
#include
Int main (void)
{
/ * Request Auto Detection * / INT GDRIVER = Detect, Gmode, ErrorCode
INT LEFT, TOP, RIGHT, BOTTOM
/ * Initialize Graphics and Local Variables * /
INITGRAPH (& GDriver, & gmode, ");
/ * Read Result of Initization * /
ErrorCode = graphresult ();
IF (ErrorCode! = GROK) / * an error occurred * /
{
Printf ("Graphics Error:% S / N", GrapherrorMsg (ErrorCode));
Printf ("Press Any Key to Halt:");
Getch ();
EXIT (1); / * Terminate with an error code * /
}
Left = getmaxx () / 2 - 50;
TOP = getMaxy () / 2 - 50;
Right = getmaxx () / 2 50;
Bottom = getMaxY () / 2 50;
/ * Draw a rectangle * /
Rectangle (LEFT, TOP, RIGHT, BOTTOM);
/ * Clean Up * /
Getch ();
Closegraph ();
Return 0;
}
Function name: RegisterBgidriver
Function: Log in to the connected graphics driver code
Usage: int REGISTERBGIDRIVER (Void (* driver));
Example:
#include
#include
#include
#include
Int main (void)
{
/ * Request Auto Detection * /
INT GDRIVER = Detect, Gmode, ERRORCODE
/ * Register a driver what was added into graphics.lib * /
ERRORCODE = RegisterBgidriver (egavga_driver);
/ * Report Any Registration Errors * /
ErrorCode <0)
{
Printf ("Graphics Error:% S / N", GrapherrorMsg (ErrorCode));
Printf ("Press Any Key to Halt:");
Getch ();
EXIT (1); / * Terminate with an error code * /
}
/ * Initialize Graphics and Local Variables * /
INITGRAPH (& GDriver, & gmode, ");
/ * Read Result of Initization * /
ErrorCode = graphresult ();
IF (ErrorCode! = GROK) / * an error occurred * /
{
Printf ("Graphics Error:% S / N", GrapherrorMsg (ErrorCode));
Printf ("Press Any Key to Halt:");
Getch ();
EXIT (1); / * Terminate with an error code * /}
/ * Draw a line * /
Line (0, 0, getmaxx (), getmaxy ());
/ * Clean Up * /
Getch ();
Closegraph ();
Return 0;
}
Function name: Remove
Function: Delete a file
Usage: int Remove (char * filename);
Example:
#include
Int main (void)
{
Char file [80];
/ * Prompt for file name to delete * /
Printf ("File to Delete:");
Gets (file);
/ * Delete the file * /
IF (remote (file) == 0)
Printf ("REMOVED% s. / n", file);
Else
PERROR ("remove");
Return 0;
}
Function name: rename
Finance: Rename file
Usage: int Rename (Char * oldname, char * newname);
Example:
#include
Int main (void)
{
Char oldname [80], newname [80];
/ * Prompt for file to rename and new name * /
Printf ("File to Rename:");
Gets (OldName);
Printf ("New Name:");
Gets (newname);
/ * Rename the file * /
IF (Rename (OldName, NewName) == 0)
Printf ("Renamed% S TO% s. / N", OldName, NewName;
Else
PERROR ("Rename");
Return 0;
}
Function name: RestoreCrtMode
Function: Recover the screen mode to the previous IMITGRAPH settings
Usage: Void Far RestoreCrtMode (Void);
Example:
#include
#include
#include
#include
Int main (void)
{
/ * Request Auto Detection * /
INT GDRIVER = Detect, Gmode, ERRORCODE
INT X, Y;
/ * Initialize Graphics and Local Variables * /
INITGRAPH (& GDriver, & gmode, ");
/ * Read Result of Initization * /
ErrorCode = graphresult ();
IF (ErrorCode! = GROK) / * an error occurred * /
{
Printf ("Graphics Error:% S / N", GrapherrorMsg (ErrorCode));
Printf ("Press Any Key to Halt:");
Getch ();
EXIT (1); / * Terminate with an error code * /
}
x = getmaxx () / 2;
y = getmaxy () / 2;
/ * OUTPUT A Message * / setTextJustify (center_text, center_text);
Outtextxy (X, Y, "Press Any Key to EXIT Graphics:");
Getch ();
/ * RESTORE SYSTEM to TEXT MODE * /
RestoreCRTMode ();
Printf ("We're now in text mode./n);
Printf ("Press Any Key to Return to Graphics Mode:");
Getch ();
/ * Return to graphics mode * /
Setgraphmode (GETGRAPHMODE ());
/ * OUTPUT A Message * /
SetTextJustify (center_text, center_text);
OutTextxy (X, Y, "We're Back in graphics mode.");
Outtextxy (x, y textheight ("w"), "Press any key to halt:");
/ * Clean Up * /
Getch ();
Closegraph ();
Return 0;
}
Function Name: Rewind
Function: Redirect file pointer to a stream
Usage: int Rewind (file * stream);
Example:
#include
#include
Int main (void)
{
File * fp;
Char * fname = "txxxxxx", * newname, first;
NewName = mktemp (fname);
fp = fopen (newname, "w ");
FPRINTF (FP, "Abcdefghijklmnopqrstuvwxyz");
Rewind (fp);
FSCANF (FP, "% C", & first);
Printf ("THE FIRST Character IS:% C / N", First);
Fclose (fp);
REMOVE (NewName);
Return 0;
}
Function name: RMDir
Function: Delete the DOS file directory
Usage: int RMDir (Char * stream);
Example:
#include
#include
#include
#include
#define dirname "Testdir. $$$"
Int main (void)
{
Int stat;
Stat = mkdir (DIRNAME);
IF (! stat)
Printf ("Directory CREATED / N");
Else
{
Printf ("Unable to create Directory / N);
Exit (1);
}
Getch ();
System ("DIR / P");
Getch ();
Stat = RMDIR (DIRNAME);
IF (! stat)
Printf ("/ ndirectory deleted / n");
Else
{
Perror ("/ NUNABLE to DELETE DIRECTORY / N");
Exit (1);
}
Return 0;
}
