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<PRE> </PRE>
<PRE>函数大全(g开头)
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">gcvt </font>
功 能: 把浮点数转换成字符串
用 法: char *gcvt(double value, int ndigit, char *buf);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
char str[25];
double num;
int sig = 5; /* significant digits */ </PRE>
<PRE>/* a regular number */
num = 9.876;
gcvt(num, sig, str);
printf("string = %s\n", str); </PRE>
<PRE>/* a negative number */
num = -123.4567;
gcvt(num, sig, str);
printf("string = %s\n", str); </PRE>
<PRE>/* scientific notation */
num = 0.678e5;
gcvt(num, sig, str);
printf("string = %s\n", str); </PRE>
<PRE>return(0);
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">geninterrupt </font>
功 能: 产生一个软中断
用 法: void geninterrupt(int intr_num);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>/* function prototype */
void writechar(char ch); </PRE>
<PRE>int main(void)
{
clrscr();
gotoxy(80,25);
writechar('*');
getch();
return 0;
} </PRE>
<PRE>/*
outputs a character at the current cursor
position using the video BIOS to avoid the
scrolling of the screen when writing to
location (80,25).
*/ </PRE>
<PRE>void writechar(char ch)
{
struct text_info ti;
/* grab current text settings */
gettextinfo(&ti);
/* interrupt 0x10 sub-function 9 */
_AH = 9;
/* character to be output */
_AL = ch;
_BH = 0; /* video page */
_BL = ti.attribute; /* video attribute */
_CX = 1; /* repetition factor */
geninterrupt(0x10); /* output the char */
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getarccoords</font>
功 能: 取得最后一次调用arc的坐标
用 法: void far getarccoords(struct arccoordstype far *arccoords);
程序例: </PRE>
<PRE>#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
struct arccoordstype arcinfo;
int midx, midy;
int stangle = 45, endangle = 270;
char sstr[80], estr[80]; </PRE>
<PRE>/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); </PRE>
<PRE>/* read result of initialization */
errorcode = graphresult();
/* an error occurred */
if (errorcode != grOk)
{
printf("Graphics error: %s\n",
grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
/* terminate with an error code */
exit(1);
} </PRE>
<PRE>midx = getmaxx() / 2;
midy = getmaxy() / 2; </PRE>
<PRE>/* draw arc and get coordinates */
setcolor(getmaxcolor());
arc(midx, midy, stangle, endangle, 100);
getarccoords(&arcinfo); </PRE>
<PRE>/* convert arc information into strings */
sprintf(sstr, "*- (%d, %d)",
arcinfo.xstart, arcinfo.ystart);
sprintf(estr, "*- (%d, %d)",
arcinfo.xend, arcinfo.yend); </PRE>
<PRE>/* output the arc information */
outtextxy(arcinfo.xstart,
arcinfo.ystart, sstr);
outtextxy(arcinfo.xend,
arcinfo.yend, estr); </PRE>
<PRE>/* clean up */
getch();
closegraph();
return 0;
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> getaspectratio </font>
功 能: 返回当前图形模式的纵横比
用 法: void far getaspectratio(int far *xasp, int far *yasp);
程序例: </PRE>
<PRE>#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int xasp, yasp, midx, midy; </PRE>
<PRE>/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); </PRE>
<PRE>/* read result of initialization */
errorcode = graphresult();
/* an error occurred */
if (errorcode != grOk)
{
printf("Graphics error: %s\n",
grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
/* terminate with an error code */
exit(1);
} </PRE>
<PRE>midx = getmaxx() / 2;
midy = getmaxy() / 2;
setcolor(getmaxcolor()); </PRE>
<PRE>/* get current aspect ratio settings */
getaspectratio(&xasp, &yasp); </PRE>
<PRE>/* draw normal circle */
circle(midx, midy, 100);
getch(); </PRE>
<PRE>/* draw wide circle */
cleardevice();
setaspectratio(xasp/2, yasp);
circle(midx, midy, 100);
getch(); </PRE>
<PRE>/* draw narrow circle */
cleardevice();
setaspectratio(xasp, yasp/2);
circle(midx, midy, 100); </PRE>
<PRE>/* clean up */
getch();
closegraph();
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getbkcolor </font>
功 能: 返回当前背景颜色
用 法: int far getbkcolor(void);
程序例: </PRE>
<PRE>#include
#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int bkcolor, midx, midy;
char bkname[35]; </PRE>
<PRE>/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); </PRE>
<PRE>/* read result of initialization */
errorcode = graphresult();
/* an error occurred */
if (errorcode != grOk)
{
printf("Graphics error: %s\n",
grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
/* terminate with an error code */
exit(1);
} </PRE>
<PRE>midx = getmaxx() / 2;
midy = getmaxy() / 2;
setcolor(getmaxcolor()); </PRE>
<PRE>/* for centering text on the display */
settextjustify(CENTER_TEXT, CENTER_TEXT); </PRE>
<PRE>/* get the current background color */
bkcolor = getbkcolor(); </PRE>
<PRE>/* convert color value into a string */
itoa(bkcolor, bkname, 10);
strcat(bkname,
" is the current background color."); </PRE>
<PRE>/* display a message */
outtextxy(midx, midy, bkname); </PRE>
<PRE>/* clean up */
getch();
closegraph();
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getc </font>
功 能: 从流中取字符
用 法: int getc(FILE *stream);
程序例: </PRE>
<PRE>#include </PRE>
<PRE>int main(void)
{
char ch; </PRE>
<PRE>printf("Input a character:");
/* read a character from the
standard input stream */
ch = getc(stdin);
printf("The character input was: '%c'\n",
ch);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getcbrk </font>
功 能: 获取Control_break设置
用 法: int getcbrk(void);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
if (getcbrk())
printf("Cntrl-brk flag is on\n");
else
printf("Cntrl-brk flag is off\n"); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> getch </font>
功 能: 从控制台无回显地取一个字符
用 法: int getch(void);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
char ch; </PRE>
<PRE>printf("Input a character:");
ch = getche();
printf("\nYou input a '%c'\n", ch);
return 0;
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> getchar </font>
功 能: 从stdin流中读字符
用 法: int getchar(void);
程序例: </PRE>
<PRE>#include </PRE>
<PRE>int main(void)
{
int c; </PRE>
<PRE>/* Note that getchar reads from stdin and
is line buffered; this means it will
not return until you press ENTER. */ </PRE>
<PRE>while ((c = getchar()) != '\n')
printf("%c", c); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getche </font>
功 能: 从控制台取字符(带回显)
用 法: int getche(void);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
char ch; </PRE>
<PRE>printf("Input a character:");
ch = getche();
printf("\nYou input a '%c'\n", ch);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getcolor </font>
功 能: 返回当前画线颜色
用 法: int far getcolor(void);
程序例: </PRE>
<PRE>#include
#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int color, midx, midy;
char colname[35]; </PRE>
<PRE>/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); </PRE>
<PRE>/* read result of initialization */
errorcode = graphresult();
/* an error occurred */
if (errorcode != grOk)
{
printf("Graphics error: %s\n",
grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
/* terminate with an error code */
exit(1);
} </PRE>
<PRE>midx = getmaxx() / 2;
midy = getmaxy() / 2;
setcolor(getmaxcolor()); </PRE>
<PRE>/* for centering text on the display */
settextjustify(CENTER_TEXT, CENTER_TEXT); </PRE>
<PRE>/* get the current drawing color */
color = getcolor(); </PRE>
<PRE>/* convert color value into a string */
itoa(color, colname, 10);
strcat(colname,
" is the current drawing color."); </PRE>
<PRE>/* display a message */
outtextxy(midx, midy, colname); </PRE>
<PRE>/* clean up */
getch();
closegraph();
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getcurdir </font>
功 能: 取指定驱动器的当前目录
用 法: int getcurdir(int drive, char *direc);
程序例: </PRE>
<PRE>#include
#include
#include </PRE>
<PRE>char *current_directory(char *path)
{
strcpy(path, "X:\\"); /* fill string with form of response: X:\ */
path[0] = 'A' + getdisk(); /* replace X with current drive letter */
getcurdir(0, path+3); /* fill rest of string with current directory */
return(path);
} </PRE>
<PRE>int main(void)
{
char curdir[MAXPATH]; </PRE>
<PRE>current_directory(curdir);
printf("The current directory is %s\n", curdir); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getcwd </font>
功 能: 取当前工作目录
用 法: char *getcwd(char *buf, int n);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
char buffer[MAXPATH]; </PRE>
<PRE>getcwd(buffer, MAXPATH);
printf("The current directory is: %s\n", buffer);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getdate </font>
功 能: 取DOS日期
用 法: void getdate(struct *dateblk);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
struct date d; </PRE>
<PRE>getdate(&d);
printf("The current year is: %d\n",
d.da_year);
printf("The current day is: %d\n",
d.da_day);
printf("The current month is: %d\n",
d.da_mon);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getdefaultpalette </font>
功 能: 返回调色板定义结构
用 法: struct palettetype *far getdefaultpalette(void);
程序例: </PRE>
<PRE>#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int i; </PRE>
<PRE>/* structure for returning palette copy */
struct palettetype far *pal=(void *) 0; </PRE>
<PRE>/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); </PRE>
<PRE>/* read result of initialization */
errorcode = graphresult();
/* an error occurred */
if (errorcode != grOk)
{
printf("Graphics error: %s\n",
grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
/* terminate with an error code */
exit(1);
} </PRE>
<PRE>setcolor(getmaxcolor()); </PRE>
<PRE>/* return a pointer to the default palette */
pal = getdefaultpalette(); </PRE>
<PRE>for (i=0; i<16; i++)
{
printf("colors[%d] = %d\n", i,
pal->colors[i]);
getch();
} </PRE>
<PRE>/* clean up */
getch();
closegraph();
return 0;
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> getdisk </font>
功 能: 取当前磁盘驱动器号
用 法: int getdisk(void);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
int disk; </PRE>
<PRE>disk = getdisk() + 'A';
printf("The current drive is: %c\n",
disk);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">getdrivername </font>
功 能: 返回指向包含当前图形驱动程序名字的字符串指针
用 法: char *getdrivename(void);
程序例: </PRE>
<PRE>#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode; </PRE>
<PRE>/* stores the device driver name */
char *drivername; </PRE>
<PRE>/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); </PRE>
<PRE>/* read result of initialization */
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