This commit is contained in:
fofolee
2019-04-08 23:22:26 +08:00
commit 7ca94f1141
5960 changed files with 530244 additions and 0 deletions

38
docs/c/fabs.html Normal file
View File

@@ -0,0 +1,38 @@
<h1>数学函数 - fabs</h1>
<p>原型extern float fabs(float x);</p>
<p>用法:#include &lt;math.h></p>
<p>功能求浮点数x的绝对值</p>
<p>说明:计算|x|, 当x不为负时返回x否则返回-x</p>
举例:<pre>
// fabs.c
#include &lt;syslib.h>
#include &lt;math.h>
main()
{
float x;
clrscr(); // clear screen
textmode(0x00); // 6 lines per LCD screen
x=-74.12;
printf("|%f|=%f\n",x,fabs(x));
x=0;
printf("|%f|=%f\n",x,fabs(x));
x=74.12;
printf("|%f|=%f\n",x,fabs(x));
getchar();
return 0;
}
</pre>相关函数:<a href="abs.html">abs</a>