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turbo c

<BR>}
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: rectangle
<BR>功&nbsp; 能: 画一个矩形
<BR>用&nbsp; 法: void far rectangle(int left, int top, int right, int bottom);
<BR>程序例:

<P>#include &lt;graphics.h>
<BR>#include &lt;stdlib.h>
<BR>#include &lt;stdio.h>
<BR>#include &lt;conio.h>

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; /* request auto detection */
<BR>&nbsp;&nbsp; int gdriver = DETECT, gmode, errorcode;
<BR>&nbsp;&nbsp; int left, top, right, bottom;

<P>&nbsp;&nbsp; /* initialize graphics and local variables */
<BR>&nbsp;&nbsp; initgraph(&amp;gdriver, &amp;gmode, "");

<P>&nbsp;&nbsp; /* read result of initialization */
<BR>&nbsp;&nbsp; errorcode = graphresult();
<BR>&nbsp;&nbsp; if (errorcode != grOk)&nbsp; /* an error occurred */
<BR>&nbsp;&nbsp; {
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Press any key to halt:");
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; getch();
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(1); /* terminate with an error
code */
<BR>&nbsp;&nbsp; }

<P>&nbsp;&nbsp; left = getmaxx() / 2 - 50;
<BR>&nbsp;&nbsp; top = getmaxy() / 2 - 50;
<BR>&nbsp;&nbsp; right = getmaxx() / 2 + 50;
<BR>&nbsp;&nbsp; bottom = getmaxy() / 2 + 50;

<P>&nbsp;&nbsp; /* draw a rectangle */
<BR>&nbsp;&nbsp; rectangle(left,top,right,bottom);

<P>&nbsp;&nbsp; /* clean up */
<BR>&nbsp;&nbsp; getch();
<BR>&nbsp;&nbsp; closegraph();
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: registerbgidriver
<BR>功&nbsp; 能: 登录已连接进来的图形驱动程序代码
<BR>用&nbsp; 法: int registerbgidriver(void(*driver)(void));
<BR>程序例:

<P>#include &lt;graphics.h>
<BR>#include &lt;stdlib.h>
<BR>#include &lt;stdio.h>
<BR>#include &lt;conio.h>

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; /* request auto detection */
<BR>&nbsp;&nbsp; int gdriver = DETECT, gmode, errorcode;

<P>&nbsp;&nbsp; /* register a driver that was added into graphics.lib */
<BR>&nbsp;&nbsp; errorcode = registerbgidriver(EGAVGA_driver);

<P>&nbsp;&nbsp; /* report any registration errors */
<BR>&nbsp;&nbsp; if (errorcode &lt; 0)
<BR>&nbsp;&nbsp; {
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Press any key to halt:");
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; getch();
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(1); /* terminate with an error
code */
<BR>&nbsp;&nbsp; }

<P>&nbsp;&nbsp; /* initialize graphics and local variables */
<BR>&nbsp;&nbsp; initgraph(&amp;gdriver, &amp;gmode, "");

<P>&nbsp;&nbsp; /* read result of initialization */
<BR>&nbsp;&nbsp; errorcode = graphresult();
<BR>&nbsp;&nbsp; if (errorcode != grOk)&nbsp; /* an error occurred */
<BR>&nbsp;&nbsp; {
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Press any key to halt:");
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; getch();
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(1); /* terminate with an error
code */
<BR>&nbsp;&nbsp; }

<P>&nbsp;&nbsp; /* draw a line */
<BR>&nbsp;&nbsp; line(0, 0, getmaxx(), getmaxy());

<P>&nbsp;&nbsp; /* clean up */
<BR>&nbsp;&nbsp; getch();
<BR>&nbsp;&nbsp; closegraph();
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: remove
<BR>功&nbsp; 能: 删除一个文件
<BR>用&nbsp; 法: int remove(char *filename);
<BR>程序例:

<P>#include &lt;stdio.h>

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; char file[80];

<P>&nbsp;&nbsp; /* prompt for file name to delete */
<BR>&nbsp;&nbsp; printf("File to delete: ");
<BR>&nbsp;&nbsp; gets(file);

<P>&nbsp;&nbsp; /* delete the file */
<BR>&nbsp;&nbsp; if (remove(file) == 0)
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Removed %s.\n",file);
<BR>&nbsp;&nbsp; else
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; perror("remove");

<P>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: rename
<BR>功&nbsp; 能: 重命名文件
<BR>用&nbsp; 法: int rename(char *oldname, char *newname);
<BR>程序例:

<P>#include &lt;stdio.h>

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; char oldname[80], newname[80];

<P>&nbsp;&nbsp; /* prompt for file to rename and new name */
<BR>&nbsp;&nbsp; printf("File to rename: ");
<BR>&nbsp;&nbsp; gets(oldname);
<BR>&nbsp;&nbsp; printf("New name: ");
<BR>&nbsp;&nbsp; gets(newname);

<P>&nbsp;&nbsp; /* Rename the file */
<BR>&nbsp;&nbsp; if (rename(oldname, newname) == 0)
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Renamed %s to %s.\n", oldname,
newname);
<BR>&nbsp;&nbsp; else
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; perror("rename");

<P>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: restorecrtmode
<BR>功&nbsp; 能: 将屏幕模式恢复为先前的imitgraph设置
<BR>用&nbsp; 法: void far restorecrtmode(void);
<BR>程序例:

<P>#include &lt;graphics.h>
<BR>#include &lt;stdlib.h>
<BR>#include &lt;stdio.h>
<BR>#include &lt;conio.h>

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; /* request auto detection */
<BR>&nbsp;&nbsp; int gdriver = DETECT, gmode, errorcode;
<BR>&nbsp;&nbsp; int x, y;

<P>&nbsp;&nbsp; /* initialize graphics and local variables */
<BR>&nbsp;&nbsp; initgraph(&amp;gdriver, &amp;gmode, "");

<P>&nbsp;&nbsp; /* read result of initialization */
<BR>&nbsp;&nbsp; errorcode = graphresult();
<BR>&nbsp;&nbsp; if (errorcode != grOk)&nbsp; /* an error occurred */
<BR>&nbsp;&nbsp; {
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Press any key to halt:");
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; getch();
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(1); /* terminate with an error
code */
<BR>&nbsp;&nbsp; }

<P>&nbsp;&nbsp; x = getmaxx() / 2;
<BR>&nbsp;&nbsp; y = getmaxy() / 2;

<P>&nbsp;&nbsp; /* output a message */
<BR>&nbsp;&nbsp; settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR>&nbsp;&nbsp; outtextxy(x, y, "Press any key to exit graphics:");
<BR>&nbsp;&nbsp; getch();

<P>&nbsp;&nbsp; /* restore system to text mode */
<BR>&nbsp;&nbsp; restorecrtmode();
<BR>&nbsp;&nbsp; printf("We're now in text mode.\n");
<BR>&nbsp;&nbsp; printf("Press any key to return to graphics mode:");
<BR>&nbsp;&nbsp; getch();

<P>&nbsp;&nbsp; /* return to graphics mode */
<BR>&nbsp;&nbsp; setgraphmode(getgraphmode());

<P>&nbsp;&nbsp; /* output a message */
<BR>&nbsp;&nbsp; settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR>&nbsp;&nbsp; outtextxy(x, y, "We're back in graphics mode.");
<BR>&nbsp;&nbsp; outtextxy(x, y+textheight("W"), "Press any key to halt:");

<P>&nbsp;&nbsp; /* clean up */
<BR>&nbsp;&nbsp; getch();
<BR>&nbsp;&nbsp; closegraph();
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: rewind
<BR>功&nbsp; 能: 将文件指针重新指向一个流的开头
<BR>用&nbsp; 法: int rewind(FILE *stream);
<BR>程序例:

<P>#include &lt;stdio.h>
<BR>#include &lt;dir.h>

<P>&nbsp;int main(void)
<BR>&nbsp;{
<BR>&nbsp;&nbsp;&nbsp; FILE *fp;
<BR>&nbsp;&nbsp;&nbsp; char *fname = "TXXXXXX", *newname, first;

<P>&nbsp;&nbsp;&nbsp; newname = mktemp(fname);
<BR>&nbsp;&nbsp;&nbsp; fp = fopen(newname,"w+");
<BR>&nbsp;&nbsp;&nbsp; fprintf(fp,"abcdefghijklmnopqrstuvwxyz");
<BR>&nbsp;&nbsp;&nbsp; rewind(fp);
<BR>&nbsp;&nbsp;&nbsp; fscanf(fp,"%c",&amp;first);
<BR>&nbsp;&nbsp;&nbsp; printf("The first character is: %c\n",first);
<BR>&nbsp;&nbsp;&nbsp; fclose(fp);
<BR>&nbsp;&nbsp;&nbsp; remove(newname);

<P>&nbsp;&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: rmdir
<BR>功&nbsp; 能: 删除DOS文件目录
<BR>用&nbsp; 法: int rmdir(char *stream);
<BR>程序例:

<P>#include &lt;stdio.h>
<BR>#include &lt;conio.h>
<BR>#include &lt;process.h>
<BR>#include &lt;dir.h>

<P>#define DIRNAME "testdir.$$$"

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; int stat;

<P>&nbsp;&nbsp; stat = mkdir(DIRNAME);
<BR>&nbsp;&nbsp; if (!stat)
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Directory
created\n");
<BR>&nbsp;&nbsp; else
<BR>&nbsp;&nbsp; {
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Unable to create directory\n");
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(1);
<BR>&nbsp;&nbsp; }

<P>&nbsp;&nbsp; getch();
<BR>&nbsp;&nbsp; system("dir/p");
<BR>&nbsp;&nbsp; getch();

<P>&nbsp;&nbsp; stat = rmdir(DIRNAME);
<BR>&nbsp;&nbsp; if (!stat)
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("\nDirectory
deleted\n");
<BR>&nbsp;&nbsp; else
<BR>&nbsp;&nbsp; {
<BR>&nbsp;&nbsp; perror("\nUnable to delete directory\n");
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(1);
<BR>&nbsp;&nbsp; }

<P>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;

<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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