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<PRE> </PRE>
<PRE>函数大全(l开头)
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">labs </font>
用 法: long labs(long n);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
long result;
long x = -12345678L; </PRE>
<PRE>result= labs(x);
printf("number: %ld abs value: %ld\n",
x, result); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">ldexp </font>
功 能: 计算value*2的幂
用 法: double ldexp(double value, int exp);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
double value;
double x = 2; </PRE>
<PRE>/* ldexp raises 2 by a power of 3
then multiplies the result by 2 */
value = ldexp(x,3);
printf("The ldexp value is: %lf\n",
value); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> ldiv </font>
功 能: 两个长整型数相除, 返回商和余数
用 法: ldiv_t ldiv(long lnumer, long ldenom);
程序例: </PRE>
<PRE>/* ldiv example */ </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
ldiv_t lx; </PRE>
<PRE>lx = ldiv(100000L, 30000L);
printf("100000 div 30000 = %ld remainder %ld\n", lx.quot, lx.rem);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">lfind </font>
功 能: 执行线性搜索
用 法: void *lfind(void *key, void *base, int *nelem, int width,
int (*fcmp)());
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int compare(int *x, int *y)
{
return( *x - *y );
} </PRE>
<PRE>int main(void)
{
int array[5] = {35, 87, 46, 99, 12};
size_t nelem = 5;
int key;
int *result; </PRE>
<PRE>key = 99;
result = lfind(&key, array, &nelem,
sizeof(int), (int(*)(const void *,const void *))compare);
if (result)
printf("Number %d found\n",key);
else
printf("Number %d not found\n",key); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> line </font>
功 能: 在指定两点间画一直线
用 法: void far line(int x0, int y0, int x1, int y1);
程序例: </PRE>
<PRE>#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int xmax, ymax; </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();
exit(1);
} </PRE>
<PRE>setcolor(getmaxcolor());
xmax = getmaxx();
ymax = getmaxy(); </PRE>
<PRE>/* draw a diagonal line */
line(0, 0, xmax, ymax); </PRE>
<PRE>/* clean up */
getch();
closegraph();
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">linerel </font>
功 能: 从当前位置点(CP)到与CP有一给定相对距离的点画一直线
用 法: void far linerel(int dx, int dy);
程序例: </PRE>
<PRE>#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
char msg[80]; </PRE>
<PRE>/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); </PRE>
<PRE>/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk)
{
printf("Graphics error: %s\n",
grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1);
} </PRE>
<PRE>/* move the C.P. to location (20, 30) */
moveto(20, 30); </PRE>
<PRE>/* create and output a
message at (20, 30) */
sprintf(msg, " (%d, %d)", getx(), gety());
outtextxy(20, 30, msg); </PRE>
<PRE>/* draw a line to a point a relative
distance away from the current
value of C.P. */
linerel(100, 100); </PRE>
<PRE>/* create and output a message at C.P. */
sprintf(msg, " (%d, %d)", getx(), gety());
outtext(msg); </PRE>
<PRE>/* clean up */
getch();
closegraph();
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">localtime </font>
功 能: 把日期和时间转变为结构
用 法: struct tm *localtime(long *clock);
程序例: </PRE>
<PRE>#include
#include
#include </PRE>
<PRE>int main(void)
{
time_t timer;
struct tm *tblock; </PRE>
<PRE>/* gets time of day */
timer = time(NULL); </PRE>
<PRE>/* converts date/time to a structure */
tblock = localtime(&timer); </PRE>
<PRE>printf("Local time is: %s", asctime(tblock)); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">lock </font>
功 能: 设置文件共享锁
用 法: int lock(int handle, long offset, long length);
程序例: </PRE>
<PRE>#include
#include
#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
int handle, status;
long length; </PRE>
<PRE>/* Must have DOS Share.exe loaded for */
/* file locking to function properly */ </PRE>
<PRE>handle = sopen("c:\\autoexec.bat",
O_RDONLY,SH_DENYNO,S_IREAD); </PRE>
<PRE>if (handle < 0)
{
printf("sopen failed\n");
exit(1);
} </PRE>
<PRE>length = filelength(handle);
status = lock(handle,0L,length/2); </PRE>
<PRE>if (status == 0)
printf("lock succeeded\n");
else
printf("lock failed\n"); </PRE>
<PRE>status = unlock(handle,0L,length/2); </PRE>
<PRE>if (status == 0)
printf("unlock succeeded\n");
else
printf("unlock failed\n"); </PRE>
<PRE>close(handle);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">log </font>
功 能: 对数函数ln(x)
用 法: double log(double x);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
double result;
double x = 8.6872; </PRE>
<PRE>result = log(x);
printf("The natural log of %lf is %lf\n", x, result); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">log10 </font>
功 能: 对数函数log
用 法: double log10(double x);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
double result;
double x = 800.6872; </PRE>
<PRE>result = log10(x);
printf("The common log of %lf is %lf\n", x, result); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">longjump </font>
功 能: 执行非局部转移
用 法: void longjump(jmp_buf env, int val);
程序例: </PRE>
<PRE>#include
#include
#include </PRE>
<PRE>void subroutine(jmp_buf); </PRE>
<PRE>int main(void)
{ </PRE>
<PRE>int value;
jmp_buf jumper; </PRE>
<PRE>value = setjmp(jumper);
if (value != 0)
{
printf("Longjmp with value %d\n", value);
exit(value);
}
printf("About to call subroutine ... \n");
subroutine(jumper); </PRE>
<PRE>return 0;
} </PRE>
<PRE>void subroutine(jmp_buf jumper)
{
longjmp(jumper,1);
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">lowvideo </font>
功 能: 选择低亮度字符
用 法: void lowvideo(void);
程序例: </PRE>
<PRE>#include </PRE>
<PRE>int main(void)
{
clrscr(); </PRE>
<PRE>highvideo();
cprintf("High Intesity Text\r\n");
lowvideo();
gotoxy(1,2);
cprintf("Low Intensity Text\r\n"); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">lrotl</font>
功 能: 将无符号长整型数向左循环移位
用 法: unsigned long lrotl(unsigned long lvalue, int count);
unsigned long _lrotl(unsigned long lvalue, int count);
程序例: </PRE>
<PRE>/* lrotl example */
#include
#include </PRE>
<PRE>int main(void)
{
unsigned long result;
unsigned long value = 100; </PRE>
<PRE>result = _lrotl(value,1);
printf("The value %lu rotated left one bit is: %lu\n", value, result); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">lsearch </font>
功 能: 线性搜索
用 法: void *lsearch(const void *key, void *base, size_t *nelem,
size_t width, int (*fcmp)(const void *, const void *));
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int compare(int *x, int *y)
{
return( *x - *y );
} </PRE>
<PRE>int main(void)
{
int array[5] = {35, 87, 46, 99, 12};
size_t nelem = 5;
int key;
int *result; </PRE>
<PRE>key = 99;
result = lfind(&key, array, &nelem,
sizeof(int), (int(*)(const void *,const void *))compare);
if (result)
printf("Number %d found\n",key);
else
printf("Number %d not found\n",key); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">lseek </font>
功 能: 移动文件读/写指针
用 法: long lseek(int handle, long offset, int fromwhere);
程序例: </PRE>
<PRE>#include
#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
int handle;
char msg[] = "This is a test";
char ch; </PRE>
<PRE>/* create a file */
handle = open("TEST.$$$", O_CREAT | O_RDWR, S_IREAD | S_IWRITE); </PRE>
<PRE>/* write some data to the file */
write(handle, msg, strlen(msg)); </PRE>
<PRE>/* seek to the begining of the file */
lseek(handle, 0L, SEEK_SET); </PRE>
<PRE>/* reads chars from the file until we hit EOF */
do
{
read(handle, &ch, 1);
printf("%c", ch);
} while (!eof(handle)); </PRE>
<PRE>close(handle);
return 0;
}
</PRE>
<pre> </pre>
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<pre></pre>
<pre> </pre>
<pre>资料收集：beck Copyright 2004 张求熙, All Rights Reserved</pre>
<pre><a href="mailto:Email:qiuxi1984@126.com">Email:qiuxi1984@126.com</a> QQ:35540948 </pre>
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