📄 王大刚--c语言编程宝典--g.htm
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- saved from url=(0038)http://www.hjflying.8u8.com/cl/026.htm -->
<HTML><HEAD><TITLE>王大刚-->C语言编程宝典-->G</TITLE>
<META http-equiv=Content-Type content="text/html; charset=GB2312">
<META content="王大刚 C语言编程宝典 G" name=keywords>
<META content="王大刚 - C语言编程宝典 - G" name=description>
<STYLE>#page {
LEFT: 0px; POSITION: absolute; TOP: 0px
}
.tt3 {
FONT: 9pt/12pt "宋体"
}
.tt2 {
FONT: 12pt/15pt "宋体"
}
A {
TEXT-DECORATION: none
}
A:hover {
COLOR: blue; TEXT-DECORATION: underline
}
</STYLE>
<META content="MSHTML 6.00.2600.0" name=GENERATOR></HEAD>
<BODY text=#000000 vLink=#006699 aLink=#9900ff link=#006699 bgColor=#ffffff
leftMargin=3 topMargin=3 marginwidth="3" marginheight="3">
<TABLE cellSpacing=0 cellPadding=10 width="100%" border=0>
<TBODY>
<TR>
<TD class=tt3 vAlign=top width="8%" bgColor=#e0e0e0><STRONG><A
href="http://www.hjflying.8u8.com/cl/027.htm">后一页</A><BR><A
href="http://www.hjflying.8u8.com/cl/025.htm">前一页</A><BR><A
href="http://www.hjflying.8u8.com/cl/index.html">回目录</A><BR><A
href="http://www.hjflying.8u8.com/index.htm">回首页</A><BR></STRONG></TD>
<TD class=tt2 width="84%" bgColor=#f5f8f8>
<CENTER><B><FONT style="FONT-SIZE: 16.5pt" face=楷体_GB2312
color=#ff6666>G</FONT></B></CENTER>
<HR width="94%" color=#ee9b73 SIZE=1>
<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: <BR>
<P>#include <stdlib.h> <BR>#include <stdio.h> <BR>
<P>int main(void) <BR>{ <BR> char str[25]; <BR>
double num; <BR> int sig = 5; /* significant digits */ <BR>
<P> /* a regular number */ <BR> num = 9.876;
<BR> gcvt(num, sig, str); <BR> printf("string =
%s\n", str); <BR>
<P> /* a negative number */ <BR> num = -123.4567;
<BR> gcvt(num, sig, str); <BR> printf("string =
%s\n", str); <BR>
<P> /* scientific notation */ <BR> num = 0.678e5;
<BR> gcvt(num, sig, str); <BR> printf("string =
%s\n", str); <BR>
<P> return(0); <BR>} <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: <BR>
<P>#include <conio.h> <BR>#include <dos.h> <BR>
<P>/* function prototype */ <BR>void writechar(char ch); <BR>
<P>int main(void) <BR>{ <BR> clrscr(); <BR>
gotoxy(80,25); <BR> writechar('*'); <BR> getch();
<BR> return 0; <BR>} <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>*/ <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> <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: <BR>
<P>#include <graphics.h> <BR>#include <stdlib.h> <BR>#include
<stdio.h> <BR>#include <conio.h> <BR>
<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]; <BR>
<P>/* initialize graphics and local variables */ <BR>
initgraph(&gdriver, &gmode, ""); <BR>
<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> } <BR>
<P> midx = getmaxx() / 2; <BR> midy = getmaxy() /
2; <BR>
<P>/* draw arc and get coordinates */ <BR>
setcolor(getmaxcolor()); <BR> arc(midx, midy, stangle,
endangle, 100); <BR> getarccoords(&arcinfo); <BR>
<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); <BR>
<P> /* output the arc information */ <BR>
outtextxy(arcinfo.xstart,
<BR>
arcinfo.ystart, sstr); <BR> outtextxy(arcinfo.xend,
<BR>
arcinfo.yend, estr); <BR>
<P> /* clean up */ <BR> getch(); <BR>
closegraph(); <BR> return 0; <BR>} <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: <BR>
<P>#include <graphics.h> <BR>#include <stdlib.h> <BR>#include
<stdio.h> <BR>#include <conio.h> <BR>
<P>int main(void) <BR>{ <BR>/* request auto detection */ <BR>
int gdriver = DETECT, gmode, errorcode; <BR> int xasp, yasp,
midx, midy; <BR>
<P>/* initialize graphics and local variables */ <BR>
initgraph(&gdriver, &gmode, ""); <BR>
<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> } <BR>
<P> midx = getmaxx() / 2; <BR> midy = getmaxy() /
2; <BR> setcolor(getmaxcolor()); <BR>
<P>/* get current aspect ratio settings */ <BR>
getaspectratio(&xasp, &yasp); <BR>
<P>/* draw normal circle */ <BR> circle(midx, midy, 100);
<BR> getch(); <BR>
<P>/* draw wide circle */ <BR> cleardevice(); <BR>
setaspectratio(xasp/2, yasp); <BR> circle(midx, midy, 100);
<BR> getch(); <BR>
<P>/* draw narrow circle */ <BR> cleardevice();
<BR> setaspectratio(xasp, yasp/2); <BR>
circle(midx, midy, 100); <BR>
<P>/* clean up */ <BR> getch(); <BR> closegraph();
<BR> return 0; <BR>} <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: <BR>
<P>#include <graphics.h> <BR>#include <stdlib.h> <BR>#include
<string.h> <BR>#include <stdio.h> <BR>#include <conio.h>
<BR>
<P>int main(void) <BR>{ <BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode; <BR>
int bkcolor, midx, midy; <BR> char bkname[35]; <BR>
<P>/* initialize graphics and local variables */ <BR>
initgraph(&gdriver, &gmode, ""); <BR>
<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> } <BR>
<P> midx = getmaxx() / 2; <BR> midy = getmaxy() /
2; <BR> setcolor(getmaxcolor()); <BR>
<P>/* for centering text on the display */ <BR>
settextjustify(CENTER_TEXT, CENTER_TEXT); <BR>
<P>/* get the current background color */ <BR> bkcolor =
getbkcolor(); <BR>
<P>/* convert color value into a string */ <BR> itoa(bkcolor,
bkname, 10); <BR> strcat(bkname, <BR> " is the current
background color."); <BR>
<P>/* display a message */ <BR> outtextxy(midx, midy, bkname);
<BR>
<P>/* clean up */ <BR> getch(); <BR> closegraph();
<BR> return 0; <BR>} <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: <BR>
<P>#include <stdio.h> <BR>
<P>int main(void) <BR>{ <BR> char ch; <BR>
<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> <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: <BR>
<P>#include <stdio.h> <BR>#include <dos.h> <BR>
<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"); <BR>
<P> return 0; <BR>} <BR> <BR> <BR>
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -