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<title>网上学堂 --> C语言编程宝典之一 -->函数名: a</title>
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<td bgcolor="#FFE6B0" bordercolor="#8080FF" class="p9"><font
color="#BB0000">导航条：--></font> <a
href="../../index.html">网上学堂</a> --> <a
href="../tcindex.htm"><font face="宋体">C</font>语言编程宝典之一</a>
-->函数名: a</td>
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<tr>
<td bordercolor="#8080FF" class="p9">函数名: abort <br>
功 能: 异常终止一个进程 <br>
用 法: void abort(void); <br>
程序例: <br>
#include <stdio.h> <br>
#include <stdlib.h> <p>int main(void) <br>
{ <br>
printf("Calling abort()\n"); <br>
abort(); <br>
return 0; /* This is never reached */ <br>
} <br>
<br>
</p>
<p>函数名: abs <br>
功 能: 求整数的绝对值 <br>
用 法: int abs(int i); <br>
程序例: <br>
#include <stdio.h> <br>
#include <math.h> </p>
<p>int main(void) <br>
{ <br>
int number = -1234; </p>
<p> printf("number: %d absolute value:
%d\n", number, abs(number)); <br>
return 0; <br>
} <br>
<br>
</p>
<p>函数名: absread, abswirte <br>
功 能: 绝对磁盘扇区读、写数据 <br>
用 法: int absread(int drive, int nsects, int
sectno, void *buffer); <br>
int abswrite(int drive, int nsects, in tsectno,
void *buffer); <br>
程序例: <br>
/* absread example */ </p>
<p>#include <stdio.h> <br>
#include <conio.h> <br>
#include <process.h> <br>
#include <dos.h> </p>
<p>int main(void) <br>
{ <br>
int i, strt, ch_out, sector; <br>
char buf[512]; </p>
<p> printf("Insert a diskette into drive A and
press any key\n"); <br>
getch(); <br>
sector = 0; <br>
if (absread(0, 1, sector, &buf) != 0) <br>
{ <br>
perror("Disk
problem"); <br>
exit(1); <br>
} <br>
printf("Read OK\n"); <br>
strt = 3; <br>
for (i=0; i<80; i++) <br>
{ <br>
ch_out = buf[strt+i]; <br>
putchar(ch_out); <br>
} <br>
printf("\n"); <br>
return(0); <br>
} <br>
<br>
<br>
</p>
<p>函数名: access <br>
功 能: 确定文件的访问权限 <br>
用 法: int access(const char *filename, int
amode); <br>
程序例: <br>
#include <stdio.h> <br>
#include <io.h> </p>
<p>int file_exists(char *filename); </p>
<p>int main(void) <br>
{ <br>
printf("Does NOTEXIST.FIL exist: %s\n", <br>
file_exists("NOTEXISTS.FIL") ?
"YES" : "NO"); <br>
return 0; <br>
} </p>
<p>int file_exists(char *filename) <br>
{ <br>
return (access(filename, 0) == 0); <br>
} <br>
</p>
<p>函数名: acos <br>
功 能: 反余弦函数 <br>
用 法: double acos(double x); <br>
程序例: <br>
#include <stdio.h> <br>
#include <math.h> </p>
<p>int main(void) <br>
{ <br>
double result; <br>
double x = 0.5; </p>
<p> result = acos(x); <br>
printf("The arc cosine of %lf is %lf\n",
x, result); <br>
return 0; <br>
} <br>
<br>
</p>
<p>函数名: allocmem <br>
功 能: 分配DOS存储段 <br>
用 法: int allocmem(unsigned size, unsigned
*seg); <br>
程序例: <br>
#include <dos.h> <br>
#include <alloc.h> <br>
#include <stdio.h> </p>
<p>int main(void) <br>
{ <br>
unsigned int size, segp; <br>
int stat; </p>
<p> size = 64; /* (64 x 16) = 1024 bytes */ <br>
stat = allocmem(size, &segp); <br>
if (stat == -1) <br>
printf("Allocated memory at
segment: %x\n", segp); <br>
else <br>
printf("Failed: maximum
number of paragraphs available is %u\n", <br>
stat); </p>
<p> return 0; <br>
} <br>
<br>
</p>
<p>函数名: arc <br>
功 能: 画一弧线 <br>
用 法: void far arc(int x, int y, int stangle,
int endangle, int radius); <br>
程序例: <br>
#include <graphics.h> <br>
#include <stdlib.h> <br>
#include <stdio.h> <br>
#include <conio.h> </p>
<p>int main(void) <br>
{ <br>
/* request auto detection */ <br>
int gdriver = DETECT, gmode, errorcode; <br>
int midx, midy; <br>
int stangle = 45, endangle = 135; <br>
int radius = 100; </p>
<p> /* initialize graphics and local
variables */ <br>
initgraph(&gdriver, &gmode,
""); </p>
<p> /* read result of initialization */ <br>
errorcode = graphresult();
/* an error occurred */ <br>
if (errorcode != grOk) <br>
{ <br>
printf("Graphics
error: %s\n", grapherrormsg(errorcode)); <br>
printf("Press any key
to halt:"); <br>
getch(); </p>
<p> exit(1);
/* terminate with an error code */ <br>
} </p>
<p> midx = getmaxx() / 2; <br>
midy = getmaxy() / 2; <br>
setcolor(getmaxcolor()); </p>
<p> /* draw arc */ <br>
arc(midx, midy, stangle, endangle, radius); </p>
<p> /* clean up */ <br>
getch(); <br>
closegraph(); <br>
return 0; <br>
} <br>
<br>
</p>
<p>函数名: asctime <br>
功 能: 转换日期和时间为ASCII码 <br>
用 法: char *asctime(const struct tm *tblock); <br>
程序例: <br>
#include <stdio.h> <br>
#include <string.h> <br>
#include <time.h> </p>
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