exp.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 EXP III 4/30/73
.sh NAME
exp \*- exponential function
.sh SYNOPSIS
.ft B
jsr	pc,exp
.s3
double exp(x)
.br
double x;
.ft R
.sh DESCRIPTION
The
exponential of fr0 is returned in fr0.
From C, the exponential of \fIx\fR is returned.
.sh DIAGNOSTICS
If
the result is not representable, the
c-bit is set
and the largest positive number is returned.
From C, no diagnostic is available.
.s3
Zero is returned if the result would underflow.
.sh BUGS