V3/usr/man/man3/ecvt.3

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NAME		ecvt, fcvt -- output conversion
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SYNOPSIS	jsr pc,ecvt
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or
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jsr pc,fcvt
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DESCRIPTION	Ecvt
is called with a floating point number in fr0.
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On exit, the number has been converted into a
string of ascii digits in a buffer pointed to by r0.
The number of digits produced is controlled
by a global variable "_ndigits".

Moreover, the position of the decimal point is
contained in r2: r2=0 means the d.p. is at the
left hand end of the string of digits;
r2>0 means the d.p. is within or to the right
of the string.

The sign of the number is indicated by r1 (0 for +; 1 for -).

The low order digit has suffered decimal rounding
(i. e. may have been carried into).
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Fcvt is identical to ecvt, except that the correct digit
has had decimal rounding for F-style output of the number
of digits specified by "_ndigits".
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FILES		kept in /lib/liba.a
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SEE ALSO	ftoa(III)
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DIAGNOSTICS	--
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BUGS		--