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<PRE> </PRE>
<PRE>函数大全(e开头)
函数名: <font size="5" color="#FF0000">ecvt</font>
功 能: 把一个浮点数转换为字符串
用 法: char ecvt(double value, int ndigit, int *decpt, int *sign);
程序例: </PRE>
<PRE>#include
#include
#include </PRE>
<PRE>int main(void)
{
char *string;
double value;
int dec, sign;
int ndig = 10; </PRE>
<PRE>clrscr();
value = 9.876;
string = ecvt(value, ndig, &dec, &sign);
printf("string = %s dec = %d \
sign = %d\n", string, dec, sign); </PRE>
<PRE>value = -123.45;
ndig= 15;
string = ecvt(value,ndig,&dec,&sign);
printf("string = %s dec = %d sign = %d\n",
string, dec, sign);
</PRE>
<PRE>value = 0.6789e5; /* scientific
notation */
ndig = 5;
string = ecvt(value,ndig,&dec,&sign);
printf("string = %s dec = %d\
sign = %d\n", string, dec, sign); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">ellipse</font>
功 能: 画一椭圆
用 法: void far ellipse(int x, int y, int stangle, int endangle,
int xradius, int yradius);
程序例: </PRE>
<PRE>#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int midx, midy;
int stangle = 0, endangle = 360;
int xradius = 100, yradius = 50; </PRE>
<PRE>/* initialize graphics, local variables */
initgraph(&gdriver, &gmode, ""); </PRE>
<PRE>/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk)
/* an error occurred */
{
printf("Graphics error: %s\n",
grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1);
/* terminate with an error code */
} </PRE>
<PRE>midx = getmaxx() / 2;
midy = getmaxy() / 2;
setcolor(getmaxcolor()); </PRE>
<PRE>/* draw ellipse */
ellipse(midx, midy, stangle, endangle,
xradius, yradius); </PRE>
<PRE>/* clean up */
getch();
closegraph();
return 0;
}
</PRE>
<PRE>函数名:<font color="#FF0000"> <font size="5">enable </font></font>
功 能: 开放硬件中断
用 法: void enable(void);
程序例: </PRE>
<PRE>/* ** NOTE:
This is an interrupt service routine. You can NOT compile this program
with Test Stack Overflow turned on and get an executable file which will
operate correctly.
*/ </PRE>
<PRE>#include
#include
#include </PRE>
<PRE>/* The clock tick interrupt */
#define INTR 0X1C </PRE>
<PRE>void interrupt ( *oldhandler)(void); </PRE>
<PRE>int count=0; </PRE>
<PRE>void interrupt handler(void)
{
/*
disable interrupts during the handling of the interrupt
*/
disable();
/* increase the global counter */
count++;
/*
re enable interrupts at the end of the handler
*/
enable();
/* call the old routine */
oldhandler();
} </PRE>
<PRE>int main(void)
{
/* save the old interrupt vector */
oldhandler = getvect(INTR); </PRE>
<PRE>/* install the new interrupt handler */
setvect(INTR, handler); </PRE>
<PRE>/* loop until the counter exceeds 20 */
while (count < 20)
printf("count is %d\n",count); </PRE>
<PRE>/* reset the old interrupt handler */
setvect(INTR, oldhandler); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">eof </font>
功 能: 检测文件结束
用 法: int eof(int *handle);
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("DUMMY.FIL",
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 beginning of the file */
lseek(handle, 0L, SEEK_SET); </PRE>
<PRE>/*
reads chars from the file until hit EOF
*/
do
{
read(handle, &ch, 1);
printf("%c", ch);
} while (!eof(handle)); </PRE>
<PRE>close(handle);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">exec...</font>
功 能: 装入并运行其它程序的函数
用 法: int execl(char *pathname, char *arg0, arg1, ..., argn, NULL);
int execle(char *pathname, char *arg0, arg1, ..., argn, NULL,
char *envp[]);
int execlp(char *pathname, char *arg0, arg1, .., NULL);
int execple(char *pathname, char *arg0, arg1, ..., NULL,
char *envp[]);
int execv(char *pathname, char *argv[]);
int execve(char *pathname, char *argv[], char *envp[]);
int execvp(char *pathname, char *argv[]);
int execvpe(char *pathname, char *argv[], char *envp[]);
程序例: </PRE>
<PRE>/* execv example */
#include
#include
#include </PRE>
<PRE>void main(int argc, char *argv[])
{
int i; </PRE>
<PRE>printf("Command line arguments:\n");
for (i=0; i printf("[%2d] : %s\n", i, argv[i]); </PRE>
<PRE>printf("About to exec child with arg1 arg2 ...\n");
execv("CHILD.EXE", argv); </PRE>
<PRE>perror("exec error"); </PRE>
<PRE>exit(1);
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">exit </font>
功 能: 终止程序
用 法: void exit(int status);
程序例: </PRE>
<PRE>#include
#include
#include </PRE>
<PRE>int main(void)
{
int status; </PRE>
<PRE>printf("Enter either 1 or 2\n");
status = getch();
/* Sets DOS errorlevel */
exit(status - '0'); </PRE>
<PRE>/* Note: this line is never reached */
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">exp </font>
功 能: 指数函数
用 法: double exp(double x);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
double result;
double x = 4.0; </PRE>
<PRE>result = exp(x);
printf("'e' raised to the power \
of %lf (e ^ %lf) = %lf\n",
x, x, result); </PRE>
<PRE>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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