Research V4 development

Work on file man/man3/atof.3

Synthesized-from: v4

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+.th ATOF III 4/30/73
+.sh NAME
+atof \*- ascii to floating
+.sh SYNOPSIS
+.ft B
+double atof(nptr)
+.br
+char *nptr;
+.br
+.ft R
+.sh DESCRIPTION
+.it Atof
+converts a string to a floating
+number.
+.it Nptr
+should point to a string containing the number;
+the first unrecognized character ends the number.
+.s3
+The only numbers recognized are:  an optional minus
+sign followed by a string of digits optionally containing
+one decimal point, then followed optionally by the
+letter \fBe\fR followed by a signed integer.
+.sh DIAGNOSTICS
+There are none; overflow results in a very large
+number and garbage characters terminate the scan.
+.sh BUGS
+The
+routine should accept initial \fB+\fR, initial blanks, and \fBE\fR for \fBe\fR.
+Overflow should be signalled.