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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>fg</TITLE></HEAD><BODY> <P>函数名: gcvt<BR>功 能: 把浮点数转换成字符串<BR>用 法: char *gcvt(double value, int ndigit, char *buf);<BR>程序例:<P>#include <stdlib.h><BR>#include <stdio.h><P>int main(void)<BR>{<BR> char str[25];<BR> double num;<BR> int sig = 5; /* significant digits */<P> /* a regular number */<BR> num = 9.876;<BR> gcvt(num, sig, str);<BR> printf("string = %s\n", str);<P> /* a negative number */<BR> num = -123.4567;<BR> gcvt(num, sig, str);<BR> printf("string = %s\n", str);<P> /* scientific notation */<BR> num = 0.678e5;<BR> gcvt(num, sig, str);<BR> printf("string = %s\n", str);<P> return(0);<BR>}<BR> <BR> <BR> <P>函数名: geninterrupt<BR>功 能: 产生一个软中断<BR>用 法: void geninterrupt(int intr_num);<BR>程序例:<P>#include <conio.h><BR>#include <dos.h><P>/* function prototype */<BR>void writechar(char ch);<P>int main(void)<BR>{<BR> clrscr();<BR> gotoxy(80,25);<BR> writechar('*');<BR> getch();<BR> return 0;<BR>}<P>/*<BR> outputs a character at the current cursor<BR> position using the video BIOS to avoid the<BR> scrolling of the screen when writing to<BR> location (80,25).<BR>*/<P>void writechar(char ch)<BR>{<BR> struct text_info ti;<BR> /* grab current text settings */<BR> gettextinfo(&ti);<BR> /* interrupt 0x10 sub-function 9 */<BR> _AH = 9;<BR> /* character to be output */<BR> _AL = ch;<BR> _BH = 0; /* video page */<BR> _BL = ti.attribute; /* video attribute */<BR> _CX = 1; /* repetition factor */<BR> geninterrupt(0x10); /* output the char */<BR>}<BR> <BR> <P>函数名: getarccoords<BR>功 能: 取得最后一次调用arc的坐标<BR>用 法: void far getarccoords(struct arccoordstype far *arccoords);<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 arccoordstype arcinfo;<BR> int midx, midy;<BR> int stangle = 45, endangle = 270;<BR> char sstr[80], estr[80];<P>/* initialize graphics and local variables */<BR> initgraph(&gdriver, &gmode, "");<P>/* read result of initialization */<BR> errorcode = graphresult();<BR>/* an error occurred */<BR> if (errorcode != grOk)<BR> {<BR> printf("Graphics error: %s\n",<BR> grapherrormsg(errorcode));<BR> printf("Press any key to halt:");<BR> getch();<BR>/* terminate with an error code */<BR> exit(1);<BR> }<P> midx = getmaxx() / 2;<BR> midy = getmaxy() / 2;<P>/* draw arc and get coordinates */<BR> setcolor(getmaxcolor());<BR> arc(midx, midy, stangle, endangle, 100);<BR> getarccoords(&arcinfo);<P>/* convert arc information into strings */<BR> sprintf(sstr, "*- (%d, %d)",<BR> arcinfo.xstart,arcinfo.ystart);<BR> sprintf(estr, "*- (%d, %d)",<BR> arcinfo.xend,arcinfo.yend);<P> /* output the arc information */<BR> outtextxy(arcinfo.xstart,<BR> arcinfo.ystart, sstr);<BR> outtextxy(arcinfo.xend,<BR> arcinfo.yend, estr);<P> /* clean up */<BR> getch();<BR> closegraph();<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: getaspectratio<BR>功 能: 返回当前图形模式的纵横比<BR>用 法: void far getaspectratio(int far *xasp, int far *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>/* an error occurred */<BR> if (errorcode != grOk)<BR> {<BR> printf("Graphics error: %s\n",<BR> grapherrormsg(errorcode));<BR> printf("Press any key to halt:");<BR> getch();<BR>/* terminate with an error code */<BR> exit(1);<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>/* draw wide circle */<BR> cleardevice();<BR> setaspectratio(xasp/2, yasp);<BR> circle(midx, midy, 100);<BR> getch();<P>/* draw 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> <BR> <P>函数名: getbkcolor<BR>功 能: 返回当前背景颜色<BR>用 法: int far getbkcolor(void);<BR>程序例:<P>#include <graphics.h><BR>#include <stdlib.h><BR>#include <string.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 bkcolor, midx, midy;<BR> char bkname[35];<P>/* initialize graphics and local variables */<BR> initgraph(&gdriver, &gmode, "");<P>/* read result of initialization */<BR> errorcode = graphresult();<BR>/* an error occurred */<BR> if (errorcode != grOk)<BR> {<BR> printf("Graphics error: %s\n",<BR> grapherrormsg(errorcode));<BR> printf("Press any key to halt:");<BR> getch();<BR>/* terminate with an error code */<BR> exit(1);<BR> }<P> midx = getmaxx() / 2;<BR> midy = getmaxy() / 2;<BR> setcolor(getmaxcolor());<P>/* for centering text on the display */<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);<P>/* get the current background color */<BR> bkcolor = getbkcolor();<P>/* convert color value into a string */<BR> itoa(bkcolor, bkname, 10);<BR> strcat(bkname,<BR> " is the current background color.");<P>/* display a message */<BR> outtextxy(midx, midy, bkname);<P>/* clean up */<BR> getch();<BR> closegraph();<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: getc<BR>功 能: 从流中取字符<BR>用 法: int getc(FILE *stream);<BR>程序例:<P>#include <stdio.h><P>int main(void)<BR>{<BR> char ch;<P> printf("Input a character:");<BR>/* read a character from the<BR> standard input stream */<BR> ch = getc(stdin);<BR> printf("The character input was: '%c'\n",<BR> ch);<BR> return 0;<BR>}<BR> <BR> <BR> <P>函数名: getcbrk<BR>功 能: 获取Control_break设置<BR>用 法: int getcbrk(void);<BR>程序例:<P>#include <stdio.h><BR>#include <dos.h><P>int main(void)<BR>{<BR> if (getcbrk())<BR> printf("Cntrl-brk flag is on\n");<BR> else<BR> printf("Cntrl-brk flag is off\n");<P> return 0;<BR>}<BR> <BR> <P>函数名: getch<BR>功 能: 从控制台无回显地取一个字符<BR>用 法: int getch(void);<BR>程序例:<P>#include <stdio.h><BR>#include <conio.h><P>int main(void)<BR>{<BR> char ch;<P> printf("Input a character:");<BR> ch = getche();<BR> printf("\nYou input a '%c'\n", ch);<BR> return 0;<BR>}<BR> <BR> <P>函数名: getchar<BR>功 能: 从stdin流中读字符<BR>用 法: int getchar(void);<BR>程序例:<P>#include <stdio.h><P>int main(void)<BR>{<BR> int c;<P> /* Note that getchar reads from stdin and<BR> is line buffered; this means it will<BR> not return until you press ENTER. */<P> while ((c = getchar()) != '\n')<BR> printf("%c", c);<P> return 0;<BR>}<BR> <BR> <P>函数名: getche<BR>功 能: 从控制台取字符(带回显)<BR>用 法: int getche(void);<BR>程序例:<P>#include <stdio.h><BR>#include <conio.h><P>int main(void)<BR>{<BR> char ch;<P> printf("Input a character:");<BR> ch = getche();<BR> printf("\nYou input a '%c'\n", ch);<BR> return 0;<BR>}<BR> <BR> <P>函数名: getcolor<BR>功 能: 返回当前画线颜色<BR>用 法: int far getcolor(void);<BR>程序例:<P>#include <graphics.h><BR>#include <stdlib.h><BR>#include <string.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 color, midx, midy;<BR> char colname[35];<P>/* initialize graphics and local variables */<BR> initgraph(&gdriver, &gmode, "");⌨️ 快捷键说明
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