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<PRE> </PRE>
<PRE>函数大全(a开头)</PRE>
<PRE>函数名: <font size="5" color="#FF0000">abort </font>
功 能: 异常终止一个进程
用 法: void abort(void);
程序例:
#include
#include </PRE>
<PRE>int main(void)
{
printf("Calling abort()\n");
abort();
return 0; /* This is never reached */
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> abs </font>
功 能: 求整数的绝对值
用 法: int abs(int i);
程序例:
#include
#include </PRE>
<PRE>int main(void)
{
int number = -1234; </PRE>
<PRE>printf("number: %d absolute value: %d\n", number, abs(number));
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">absread, abswirte</font>
功 能: 绝对磁盘扇区读、写数据
用 法: int absread(int drive, int nsects, int sectno, void *buffer);
int abswrite(int drive, int nsects, in tsectno, void *buffer);
程序例:
/* absread example */ </PRE>
<PRE>#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
int i, strt, ch_out, sector;
char buf[512]; </PRE>
<PRE>printf("Insert a diskette into drive A and press any key\n");
getch();
sector = 0;
if (absread(0, 1, sector, &buf) != 0)
{
perror("Disk problem");
exit(1);
}
printf("Read OK\n");
strt = 3;
for (i=0; i<80; i++)
{
ch_out = buf[strt+i];
putchar(ch_out);
}
printf("\n");
return(0);
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">access </font>
功 能: 确定文件的访问权限
用 法: int access(const char *filename, int amode);
程序例:
#include
#include </PRE>
<PRE>int file_exists(char *filename); </PRE>
<PRE>int main(void)
{
printf("Does NOTEXIST.FIL exist: %s\n",
file_exists("NOTEXISTS.FIL") ? "YES" : "NO");
return 0;
} </PRE>
<PRE>int file_exists(char *filename)
{
return (access(filename, 0) == 0);
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">acos </font>
功 能: 反余弦函数
用 法: double acos(double x);
程序例:
#include
#include </PRE>
<PRE>int main(void)
{
double result;
double x = 0.5; </PRE>
<PRE>result = acos(x);
printf("The arc cosine of %lf is %lf\n", x, result);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">allocmem </font>
功 能: 分配DOS存储段
用 法: int allocmem(unsigned size, unsigned *seg);
程序例:
#include
#include
#include </PRE>
<PRE>int main(void)
{
unsigned int size, segp;
int stat; </PRE>
<PRE>size = 64; /* (64 x 16) = 1024 bytes */
stat = allocmem(size, &segp);
if (stat == -1)
printf("Allocated memory at segment: %x\n", segp);
else
printf("Failed: maximum number of paragraphs available is %u\n",
stat); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名: <font color="#FF0000" size="5">arc </font>
功 能: 画一弧线
用 法: void far arc(int x, int y, int stangle, int endangle, int radius);
程序例:
#include
#include
#include
#include </PRE>
<PRE>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int midx, midy;
int stangle = 45, endangle = 135;
int radius = 100; </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(); </PRE>
<PRE>exit(1); /* terminate with an error code */
} </PRE>
<PRE>midx = getmaxx() / 2;
midy = getmaxy() / 2;
setcolor(getmaxcolor()); </PRE>
<PRE>/* draw arc */
arc(midx, midy, stangle, endangle, radius); </PRE>
<PRE>/* clean up */
getch();
closegraph();
return 0;
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> asctime </font>
功 能: 转换日期和时间为ASCII码
用 法: char *asctime(const struct tm *tblock);
程序例:
#include
#include
#include </PRE>
<PRE>int main(void)
{
struct tm t;
char str[80]; </PRE>
<PRE>/* sample loading of tm structure */ </PRE>
<PRE>t.tm_sec = 1; /* Seconds */
t.tm_min = 30; /* Minutes */
t.tm_hour = 9; /* Hour */
t.tm_mday = 22; /* Day of the Month */
t.tm_mon = 11; /* Month */
t.tm_year = 56; /* Year - does not include century */
t.tm_wday = 4; /* Day of the week */
t.tm_yday = 0; /* Does not show in asctime */
t.tm_isdst = 0; /* Is Daylight SavTime; does not show in asctime */ </PRE>
<PRE>/* converts structure to null terminated
string */ </PRE>
<PRE>strcpy(str, asctime(&t));
printf("%s\n", str); </PRE>
<PRE>return 0;
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> asin </font>
功 能: 反正弦函数
用 法: double asin(double x);
程序例:
#include
#include </PRE>
<PRE>int main(void)
{
double result;
double x = 0.5; </PRE>
<PRE>result = asin(x);
printf("The arc sin of %lf is %lf\n", x, result);
return(0);
}
</PRE>
<PRE>函数名: <font face="5" size="5" color="#FF0000">assert</font>
功 能: 测试一个条件并可能使程序终止
用 法: void assert(int test);
程序例:
#include
#include
#include </PRE>
<PRE>struct ITEM {
int key;
int value;
}; </PRE>
<PRE>/* add item to list, make sure list is not null */
void additem(struct ITEM *itemptr) {
assert(itemptr != NULL);
/* add item to list */
} </PRE>
<PRE>int main(void)
{
additem(NULL);
return 0;
}
</PRE>
<PRE>函数名:<font size="5" color="#FF0000"> atan </font>
功 能: 反正切函数
用 法: double atan(double x);
程序例:
#include
#include </PRE>
<PRE>int main(void)
{
double result;
double x = 0.5; </PRE>
<PRE>result = atan(x);
printf("The arc tangent of %lf is %lf\n", x, result);
return(0);
}
</PRE>
<PRE>函数名:<font face="5" size="5" color="#FF0000"> atan2 </font>
功 能: 计算Y/X的反正切值
用 法: double atan2(double y, double x);
程序例:
#include
#include </PRE>
<PRE>int main(void)
{
double result;
double x = 90.0, y = 45.0; </PRE>
<PRE>result = atan2(y, x);
printf("The arc tangent ratio of %lf is %lf\n", (y / x), result);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">atexit</font>
功 能: 注册终止函数
用 法: int atexit(atexit_t func);
程序例:
#include
#include </PRE>
<PRE>void exit_fn1(void)
{
printf("Exit function #1 called\n");
} </PRE>
<PRE>void exit_fn2(void)
{
printf("Exit function #2 called\n");
} </PRE>
<PRE>int main(void)
{
/* post exit function #1 */
atexit(exit_fn1);
/* post exit function #2 */
atexit(exit_fn2);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">atof </font>
功 能: 把字符串转换成浮点数
用 法: double atof(const char *nptr);
程序例:
#include
#include </PRE>
<PRE>int main(void)
{
float f;
char *str = "12345.67"; </PRE>
<PRE>f = atof(str);
printf("string = %s float = %f\n", str, f);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">atoi </font>
功 能: 把字符串转换成长整型数
用 法: int atoi(const char *nptr);
程序例:
#include
#include </PRE>
<PRE>int main(void)
{
int n;
char *str = "12345.67"; </PRE>
<PRE>n = atoi(str);
printf("string = %s integer = %d\n", str, n);
return 0;
}
</PRE>
<PRE>函数名: <font size="5" color="#FF0000">atol </font>
功 能: 把字符串转换成长整型数
用 法: long atol(const char *nptr);
程序例: </PRE>
<PRE>#include
#include </PRE>
<PRE>int main(void)
{
long l;
char *str = "98765432"; </PRE>
<PRE>l = atol(lstr);
printf("string = %s integer = %ld\n", str, l);
return(0);
}
</PRE>
<PRE><font size="5"><a href="a.htm">A</a> <a href="b.htm">B</a> <a href="c.htm">C</a> <a href="d.htm">D</a> <a href="e.htm">E</a> <a href="f.htm">F</a> <a href="g.htm">G</a> <a href="h.htm">H</a> <a href="i.htm">I</a> <a href="k.htm">K</a> <a href="l.htm">L</a> <a href="m.htm">M</a> <a href="n.htm">N</a> <a href="o.htm">O</a> <a href="p.htm">P</a> <a href="q.htm">Q</a> <a href="r.htm">R</a> <a href="s.htm">S</a> <a href="t.htm">T</a> <a href="u.htm">U</a> <a href="v.htm">V</a> <a href="w.htm">W</a> </font></PRE>
<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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