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<HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312"> <META NAME="Author" CONTENT="wdg"> <META NAME="GENERATOR" CONTENT="Mozilla/4.03 [en] (Win95; I) [Netscape]"> <TITLE>fs</TITLE></HEAD><BODY> <P>函数名: sbrk<BR>功 能: 改变数据段空间位置<BR>用 法: char *sbrk(int incr);<BR>程序例:<P>#include <stdio.h><BR>#include <alloc.h><P>int main(void)<BR>{<BR> printf("Changing allocation with sbrk()\n");<BR> printf("Before sbrk() call: %lu bytes free\n",<BR> (unsigned long) coreleft());<BR> sbrk(1000);<BR> printf(" After sbrk() call: %lu bytes free\n",<BR> (unsigned long) coreleft());<BR> return 0;<BR>}<BR> <BR> <P>函数名: scanf<BR>功 能: 执行格式化输入<BR>用 法: int scanf(char *format[,argument,...]);<BR>程序例:<P>#include <stdio.h><BR>#include <conio.h><P>int main(void)<BR>{<BR> char label[20];<BR> char name[20];<BR> int entries = 0;<BR> int loop, age;<BR> double salary;<P> struct Entry_struct<BR> {<BR> char name[20];<BR> int age;<BR> float salary;<BR> } entry[20];<P>/* Input a label as a string of characters restricting to 20 characters*/<BR> printf("\n\nPlease enter a label for the chart: ");<BR> scanf("%20s", label);<BR> fflush(stdin); /* flush the input stream in caseof bad input */<P>/* Input number of entries as an integer */<BR> printf("How many entries will there be? (less than 20)");<BR> scanf("%d", &entries);<BR> fflush(stdin); /* flush the input stream incase of bad input */<P>/* input a name restricting input to only letters upper or lower case*/<BR> for (loop=0;loop<entries;++loop)<BR> {<BR> printf("Entry %d\n", loop);<BR> printf(" Name : ");<BR> scanf("%[A-Za-z]", entry[loop].name);<BR> fflush(stdin); /* flush the inputstream in case of bad input */<P>/* input an age as an integer */<BR> printf(" Age : ");<BR> scanf("%d", &entry[loop].age);<BR> fflush(stdin); /* flush the inputstream in case of bad input */<P>/* input a salary as a float */<BR> printf(" Salary : ");<BR> scanf("%f", &entry[loop].salary);<BR> fflush(stdin); /* flush the input streamin case of bad input */<BR> }<P>/* Input a name, age and salary as a string, integer, and double */<BR> printf("\nPlease enter your name, age and salary\n");<BR> scanf("%20s %d %lf", name, &age, &salary);<BR> <P>/* Print out the data that was input */<BR> printf("\n\nTable %s\n",label);<BR> printf("Compiled by %s age %d $%15.2lf\n",name, age, salary);<BR> printf("-----------------------------------------------------\n");<BR> for (loop=0;loop<entries;++loop)<BR> printf("%4d | %-20s | %5d | %15.2lf\n",<BR> loop + 1,<BR> entry[loop].name,<BR> entry[loop].age,<BR> entry[loop].salary);<BR> printf("-----------------------------------------------------\n");<BR> return 0;<BR>}<BR> <BR> <P>函数名: searchpath<BR>功 能: 搜索DOS路径<BR>用 法: char *searchpath(char *filename);<BR>程序例:<P>#include <stdio.h><BR>#include <dir.h><P>int main(void)<BR>{<BR> char *p;<P> /* Looks for TLINK and returns a pointer<BR> to the path */<BR> p = searchpath("TLINK.EXE");<BR> printf("Search for TLINK.EXE : %s\n", p);<P> /* Looks for non-existent file */<BR> p = searchpath("NOTEXIST.FIL");<BR> printf("Search for NOTEXIST.FIL : %s\n", p);<P> return 0;<BR>}<BR> <BR> <P>函数名: sector<BR>功 能: 画并填充椭圆扇区<BR>用 法: void far sector(int x, int y, int stangle, int endangle);<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> /* request auto detection */<BR> int gdriver = DETECT, gmode, errorcode;<BR> int midx, midy, i;<BR> int stangle = 45, endangle = 135;<BR> int xrad = 100, yrad = 50;<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 errorcode */<BR> }<P> midx = getmaxx() / 2;<BR> midy = getmaxy() / 2;<P> /* loop through the fill patterns */<BR> for (i=EMPTY_FILL; i<USER_FILL; i++)<BR> {<BR> /* set the fill style */<BR> setfillstyle(i, getmaxcolor());<P> /* draw the sector slice */<BR> sector(midx, midy, stangle, endangle,xrad, yrad);<P> getch();<BR> }<P> /* clean up */<BR> closegraph();<BR> return 0;<BR>}<BR> <P>函数名: segread<BR>功 能: 读段寄存器值<BR>用 法: void segread(struct SREGS *segtbl);<BR>程序例:<P>#include <stdio.h><BR>#include <dos.h><P>int main(void)<BR>{<BR> struct SREGS segs;<P> segread(&segs);<BR> printf("Current segment register settings\n\n");<BR> printf("CS: %X DS: %X\n", segs.cs, segs.ds);<BR> printf("ES: %X SS: %X\n", segs.es, segs.ss);<P> return 0;<BR>}<BR> <BR> <P>函数名: setactivepage<BR>功 能: 设置图形输出活动页<BR>用 法: void far setactivepage(int pagenum);<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 pages. */<BR> int gdriver = EGA, gmode = EGAHI, errorcode;<BR> int x, y, ht;<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 errorcode */<BR> }<P> x = getmaxx() / 2;<BR> y = getmaxy() / 2;<BR> ht = textheight("W");<P> /* select the off screen page for drawing */<BR> setactivepage(1);<P> /* draw a line on page #1 */<BR> line(0, 0, getmaxx(), getmaxy());<P> /* output a message on page #1 */<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);<BR> outtextxy(x, y, "This is page #1:");<BR> outtextxy(x, y+ht, "Press any key to halt:");<P> /* select drawing to page #0 */<BR> setactivepage(0);<P> /* output a message on page #0 */<BR> outtextxy(x, y, "This is page #0.");<BR> outtextxy(x, y+ht, "Press any key to view page #1:");<BR> getch();<P> /* select page #1 as the visible page */<BR> setvisualpage(1);<P> /* clean up */<BR> getch();<BR> closegraph();<BR> return 0;<BR>}<BR> <BR> <P>函数名: setallpallette<BR>功 能: 按指定方式改变所有的调色板颜色<BR>用 法: void far setallpallette(struct palette, far *pallette);<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> /* request auto detection */<BR> int gdriver = DETECT, gmode, errorcode;<BR> struct palettetype pal;<BR> int color, maxcolor, ht;<BR> int y = 10;<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 errorcode */<BR> }<P> maxcolor = getmaxcolor();<BR> ht = 2 * textheight("W");<P> /* grab a copy of the palette */<BR> getpalette(&pal);<P> /* display the default palette colors */<BR> for (color=1; color<=maxcolor; color++)<BR> {<BR> setcolor(color);<BR> sprintf(msg, "Color: %d", color);<BR> outtextxy(1, y, msg);<BR> y += ht;<BR> }<P> /* wait for a key */<BR> getch();<P> /* black out the colors one by one */<BR> for (color=1; color<=maxcolor; color++)<BR> {<BR> setpalette(color, BLACK);<BR> getch();<BR> }<P> /* restore the palette colors */<BR> setallpalette(&pal);<P> /* clean up */<BR> getch();<BR> closegraph();<BR> return 0;<BR>}<BR> <BR> <P>函数名: setaspectratio<BR>功 能: 设置图形纵横比<BR>用 法: void far setaspectratio(int xasp, int yasp);<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> /* request auto detection */<BR> int gdriver = DETECT, gmode, errorcode;<BR> int xasp, yasp, midx, midy;<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 errorcode */<BR> }<P> midx = getmaxx() / 2;<BR> midy = getmaxy() / 2;<BR> setcolor(getmaxcolor());<P> /* get current aspect ratio settings */<BR> getaspectratio(&xasp, &yasp);<P> /* draw normal circle */<BR> circle(midx, midy, 100);<BR> getch();<P> /* claer the screen */<BR> cleardevice();<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 */⌨️ 快捷键说明
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