c语言函数大全

墙角野猫

函数名: mktemp
功 能: 建立唯一的文件名
用 法: char *mktemp(char *template);
程序例:
#include
#include
int main(void)
{
/* fname defines the template for the
temporary file. */
char *fname = "TXXXXXX", *ptr;
ptr = mktemp(fname);
printf("%s
",ptr);
return 0;
}

墙角野猫

函数名: MK_FP
功 能: 设置一个远指针
用 法: void far *MK_FP(unsigned seg, unsigned off);
程序例:
#include
#include
int main(void)
{
int gd, gm, i;
unsigned int far *screen;
detectgraph(&gd, &gm);
if (gd == HERCMONO)
screen = MK_FP(0xB000, 0);
else
screen = MK_FP(0xB800, 0);
for (i=0; i<26; i++)
screen = 0x0700 + (&#39;a&#39; + i);
return 0;
}

墙角野猫

函数名: modf
功 能: 把数分为指数和尾数
用 法: double modf(double value, double *iptr);
程序例:
#include
#include
int main(void)
{
double fraction, integer;
double number = 100000.567;
fraction = modf(number, &integer);
printf("The whole and fractional parts of %lf are %lf and %lf
",
number, integer, fraction);
return 0;
}

墙角野猫

函数名: movedata
功 能: 拷贝字节
用 法: void movedata(int segsrc, int offsrc, int segdest,
int offdest, unsigned numbytes);
程序例:
#include
#define MONO_BASE 0xB000
/* saves the contents of the monochrome screen in buffer */
void save_mono_screen(char near *buffer)
{
movedata(MONO_BASE, 0, _DS, (unsigned)buffer, 80*25*2);
}
int main(void)
{
char buf[80*25*2];
save_mono_screen(buf);
}

墙角野猫

函数名: moverel
功 能: 将当前位置(CP)移动一相对距离
用 法: void far moverel(int dx, int dy);
程序例:
#include
#include
#include
#include
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
char msg[80];
/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "");
/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk) /* an error occurred */
{
printf("Graphics error: %s
", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
/* move the C.P. to location (20, 30) */
moveto(20, 30);
/* plot a pixel at the C.P. */
putpixel(getx(), gety(), getmaxcolor());
/* create and output a message at (20, 30) */
sprintf(msg, " (%d, %d)", getx(), gety());
outtextxy(20, 30, msg);
/* move to a point a relative distance */
/* away from the current value of C.P. */
moverel(100, 100);
/* plot a pixel at the C.P. */
putpixel(getx(), gety(), getmaxcolor());
/* create and output a message at C.P. */
sprintf(msg, " (%d, %d)", getx(), gety());
outtext(msg);
/* clean up */
getch();
closegraph();
return 0;
}

墙角野猫

函数名: movetext
功 能: 将屏幕文本从一个矩形区域拷贝到另一个矩形区域
用 法: int movetext(int left, int top, int right, int bottom,
int newleft, int newtop);
程序例:
#include
#include
int main(void)
{
char *str = "This is a test string";
clrscr();
cputs(str);
getch();
movetext(1, 1, strlen(str), 2, 10, 10);
getch();
return 0;
}

墙角野猫

函数名: moveto
功 能: 将CP移到(x, y)
用 法: void far moveto(int x, int y);
程序例:
#include
#include
#include
#include
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
char msg[80];
/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "");
/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk) /* an error occurred */
{
printf("Graphics error: %s
", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
/* move the C.P. to location (20, 30) */
moveto(20, 30);
/* plot a pixel at the C.P. */
putpixel(getx(), gety(), getmaxcolor());
/* create and output a message at (20, 30) */
sprintf(msg, " (%d, %d)", getx(), gety());
outtextxy(20, 30, msg);
/* move to (100, 100) */
moveto(100, 100);
/* plot a pixel at the C.P. */
putpixel(getx(), gety(), getmaxcolor());
/* create and output a message at C.P. */
sprintf(msg, " (%d, %d)", getx(), gety());
outtext(msg);
/* clean up */
getch();
closegraph();
return 0;
}

墙角野猫

函数名: movemem
功 能: 移动一块字节
用 法: void movemem(void *source, void *destin, unsigned len);
程序例:
#include
#include
#include
#include
int main(void)
{
char *source = "Borland International";
char *destination;
int length;
length = strlen(source);
destination = malloc(length + 1);
movmem(source,destination,length);
printf("%s
",destination);
return 0;
}

墙角野猫

函数名: normvideo
功 能: 选择正常亮度字符
用 法: void normvideo(void);
程序例:
#include
int main(void)
{
normvideo();
cprintf("NORMAL Intensity Text\r
");
return 0;
}

墙角野猫

函数名: nosound
功 能: 关闭PC扬声器
用 法: void nosound(void);
程序例:
/* Emits a 7-Hz tone for 10 seconds.
True story: 7 Hz is the resonant frequency of a chicken&#39;s skull cavity.
This was determined empirically in Australia, where a new factory
generating 7-Hz tones was located too close to a chicken ranch:
When the factory started up, all the chickens died.
Your PC may not be able to emit a 7-Hz tone.
*/
int main(void)
{
sound(7);
delay(10000);
nosound();
}

void normvideo(void );
选择正常亮度字符。
将文本属性（前景和背景）置为启动程序时它所具有的值，来选择标准字符。

void nosound(void );
关闭由调用 sound而发声的扬声器。