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<P> /* adjust the aspect for a wide circle */
<BR> setaspectratio(xasp/2, yasp);
<BR> circle(midx, midy, 100);
<BR> getch();
<P> /* adjust the aspect for a narrow circle */
<BR> cleardevice();
<BR> setaspectratio(xasp, yasp/2);
<BR> circle(midx, midy, 100);
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: setbkcolor
<BR>功 能: 用調色板設置當前背景顏色
<BR>用 法: void far setbkcolor(int color);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR> /* select a driver and mode that supports */
<BR> /* multiple background colors.
*/
<BR> int gdriver = EGA, gmode = EGAHI, errorcode;
<BR> int bkcol, maxcolor, x, y;
<BR> char msg[80];
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<P> /* maximum color index supported */
<BR> maxcolor = getmaxcolor();
<P> /* for centering text messages */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> x = getmaxx() / 2;
<BR> y = getmaxy() / 2;
<P> /* loop through the available colors */
<BR> for (bkcol=0; bkcol<=maxcolor; bkcol++)
<BR> {
<BR> /* clear the screen */
<BR> cleardevice();
<P> /* select a new background color */
<BR> setbkcolor(bkcol);
<P> /* output a messsage */
<BR> if (bkcol == WHITE)
<BR> setcolor(EGA_BLUE);
<BR> sprintf(msg, "Background color: %d",
bkcol);
<BR> outtextxy(x, y, msg);
<BR> getch();
<BR> }
<P> /* clean up */
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: setblock
<BR>功 能: 修改先前已分配的DOS存儲段大小
<BR>用 法: int setblock(int seg, int newsize);
<BR>程序例:
<P>#include <dos.h>
<BR>#include <alloc.h>
<BR>#include <stdio.h>
<BR>#include <stdlib.h>
<P>int main(void)
<BR>{
<BR> unsigned int size, segp;
<BR> int stat;
<P> size = 64; /* (64 x 16) = 1024 bytes */
<BR> stat = allocmem(size, &segp);
<BR> if (stat == -1)
<BR> printf("Allocated memory at segment:
%X\n", segp);
<BR> else
<BR> {
<BR> printf("Failed: maximum number of paragraphs
available is %d\n",
<BR> stat);
<BR> exit(1);
<BR> }
<P> stat = setblock(segp, size * 2);
<BR> if (stat == -1)
<BR> printf("Expanded memory block at segment:
%X\n", segp);
<BR> else
<BR> printf("Failed: maximum number of paragraphs
available is %d\n",
<BR>
stat);
<P> freemem(segp);
<P> return 0;
<BR>}
<BR>
<BR>
<P>函數名: setbuf
<BR>功 能: 把緩沖區與流相聯
<BR>用 法: void setbuf(FILE *steam, char *buf);
<BR>程序例:
<P>#include <stdio.h>
<P>/* BUFSIZ is defined in stdio.h */
<BR>char outbuf[BUFSIZ];
<P>int main(void)
<BR>{
<BR> /* attach a buffer to the standard output stream */
<BR> setbuf(stdout, outbuf);
<P> /* put some characters into the buffer */
<BR> puts("This is a test of buffered output.\n\n");
<BR> puts("This output will go into outbuf\n");
<BR> puts("and won't appear until the buffer\n");
<BR> puts("fills up or we flush the stream.\n");
<P> /* flush the output buffer */
<BR> fflush(stdout);
<P> return 0;
<BR>}
<BR>
<BR>
<P>函數名: setcbrk
<BR>功 能: 設置Control-break
<BR>用 法: int setcbrk(int value);
<BR>程序例:
<P>#include <dos.h>
<BR>#include <conio.h>
<BR>#include <stdio.h>
<P>int main(void)
<BR>{
<BR> int break_flag;
<P> printf("Enter 0 to turn control break off\n");
<BR> printf("Enter 1 to turn control break on\n");
<P> break_flag = getch() - 0;
<P> setcbrk(break_flag);
<P> if (getcbrk())
<BR> printf("Cntrl-brk flag is on\n");
<BR> else
<BR> printf("Cntrl-brk flag is off\n");
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<P>函數名: setcolor
<BR>功 能: 設置當前畫線顏色
<BR>用 法: void far setcolor(int color);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR> /* select a driver and mode that supports */
<BR> /* multiple drawing colors.
*/
<BR> int gdriver = EGA, gmode = EGAHI, errorcode;
<BR> int color, maxcolor, x, y;
<BR> char msg[80];
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<P> /* maximum color index supported */
<BR> maxcolor = getmaxcolor();
<P> /* for centering text messages */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> x = getmaxx() / 2;
<BR> y = getmaxy() / 2;
<P> /* loop through the available colors */
<BR> for (color=1; color<=maxcolor; color++)
<BR> {
<BR> /* clear the screen */
<BR> cleardevice();
<P> /* select a new background color */
<BR> setcolor(color);
<P> /* output a messsage */
<BR> sprintf(msg, "Color: %d", color);
<BR> outtextxy(x, y, msg);
<BR> getch();
<BR> }
<P> /* clean up */
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: setdate
<BR>功 能: 設置DOS日期
<BR>用 法: void setdate(struct date *dateblk);
<BR>程序例:
<P>#include <stdio.h>
<BR>#include <process.h>
<BR>#include <dos.h>
<P>int main(void)
<BR>{
<BR> struct date reset;
<BR> struct date save_date;
<P> getdate(&save_date);
<BR> printf("Original date:\n");
<BR> system("date");
<P> reset.da_year = 2001;
<BR> reset.da_day = 1;
<BR> reset.da_mon = 1;
<BR> setdate(&reset);
<P> printf("Date after setting:\n");
<BR> system("date");
<P> setdate(&save_date);
<BR> printf("Back to original date:\n");
<BR> system("date");
<P> return 0;
<BR>}
<BR>
<BR>
<P>函數名: setdisk
<BR>功 能: 設置當前磁盤驅動器
<BR>用 法: int setdisk(int drive);
<BR>程序例:
<P>#include <stdio.h>
<BR>#include <dir.h>
<P>int main(void)
<BR>{
<BR> int save, disk, disks;
<P> /* save original drive */
<BR> save = getdisk();
<P> /* print number of logic drives */
<BR> disks = setdisk(save);
<BR> printf("%d logical drives on the system\n\n", disks);
<P> /* print the drive letters available */
<BR> printf("Available drives:\n");
<BR> for (disk = 0;disk < 26;++disk)
<BR> {
<BR> setdisk(disk);
<BR> if (disk == getdisk())
<BR> printf("%c: drive
is available\n", disk + 'a');
<BR> }
<BR> setdisk(save);
<P> return 0;
<BR>}
<BR>
<BR>
<P>函數名: setdta
<BR>功 能: 設置磁盤傳輸區地址
<BR>用 法: void setdta(char far *dta);
<BR>程序例:
<P>#include <process.h>
<BR>#include <string.h>
<BR>#include <stdio.h>
<BR>#include <dos.h>
<P>int main(void)
<BR>{
<BR> char line[80], far *save_dta;
<BR> char buffer[256] = "SETDTA test!";
<BR> struct fcb blk;
<BR> int result;
<P> /* get new file name from user */
<BR> printf("Enter a file name to create:");
<BR> gets(line);
<P> /* parse the new file name to the dta */
<BR> parsfnm(line, &blk, 1);
<BR> printf("%d %s\n", blk.fcb_drive, blk.fcb_name);
<P> /* request DOS services to create file */
<BR> if (bdosptr(0x16, &blk, 0) == -1)
<BR> {
<BR> perror("Error creating file");
<BR> exit(1);
<BR> }
<P> /* save old dta and set new dta */
<BR> save_dta = getdta();
<BR> setdta(buffer);
<P> /* write new records */
<BR> blk.fcb_recsize = 256;
<BR> blk.fcb_random = 0L;
<BR> result = randbwr(&blk, 1);
<BR> printf("result = %d\n", result);
<P> if (!result)
<BR> printf("Write OK\n");
<BR> else
<BR> {
<BR> perror("Disk error");
<BR> exit(1);
<BR> }
<P> /* request DOS services to close the file */
<BR> if (bdosptr(0x10, &blk, 0) == -1)
<BR> {
<BR> perror("Error closing file");
<BR> exit(1);
<BR> }
<P> /* reset the old dta */
<BR> setdta(save_dta);
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: setfillpattern
<BR>功 能: 選擇用戶定義的填充模式
<BR>用 法: void far setfillpattern(char far *upattern, int color);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
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