log.3

UNIX v6源代码 这几乎是最经典的unix版本 unix操作系统设计和莱昂氏unix源代码分析都是用的该版

.th LOG III 4/30/72
.sh NAME
log \*- natural logarithm
.sh SYNOPSIS
.ft B
jsr	pc,log
.s3
double log(x)
.br
double x;
.ft R
.sh DESCRIPTION
The
natural logarithm of fr0 is returned in fr0.
From C, the natural logarithm of \fBx\fR is returned.
.sh DIAGNOSTICS
The error bit (c-bit)
is set if the input argument is less than or
equal to zero and the result is a
negative number very large in magnitude.
From C, there is no error indication.
.sh BUGS