// PrintFloat(str,lvnum)	Prints floating point number.
// Copyright Xerox Corporation 1979


//outgoing routines
external PrintFloat

external 
	[
	//OS
	Puts
	Wns

//FLOAT
	FLD;FST;FTR;FLDI;FNEG;FAD;FSB;FML;FDV;FCM;FSN
	FLDV;FSTV;FLDDP;FSTDP;DPAD;DPSB
	]

// incoming statics
external
	[
	keys
	dsp
	]

// internal statics
static
	[
	coms
	sc
	]

// File-wide structure and manifest declarations.

structure STR: [
	length byte
	char^1,255 byte
]

manifest strlen=10		//number of words

// Procedures
let PrintFloat(s,lvnum) be [
	let v=vec 4*5
	for i=1 to 4 do FSTV(i,v+4*i)
	FLD(1,lvnum)
	let p=FSN(1)
	test p eq 0 then Puts(s,$0) or [		//Really work
	if p eq -1 then [ FNEG(1); Puts(s,$-) ]

	FLDV(2,table [ 0; 1; #100000; 4 ]); 	//Fuzz1= 1+2E-9
	FML(1,2)	//n_fuzz1*number
	FLDI(3,1);FLDI(2,10)
	FLD(4,1)	//number
	p=0
	while FCM(4,2) eq 1 do [ FDV(4,2); p=p+1 ]
	while FCM(4,3) eq -1 do [ FML(4,2); p=p-1 ]

// 4 has  number between 1 and 10, and p has power

	FLD(3,table [ #031325; #163073 ])	//Fuzz2 = 5E-9
	FML(3,1)	//s_fuzz2 * n
	let q=p
	test p gr 7 % p ls -3 then p=0 or q=0
	test p ls 0 then [ Puts(s,$0); Puts(s,$.)
		for i=p to -2 do Puts(s,$0)
		for i=1 to -p do FDV(3,2)	//s=s E P
	] or [	for i=1 to p do FML(3,2) ]

//now print (s suppresses trailing zeroes)

	for i=1 to 9 do [
		let ipart=FTR(4)
		Puts(s,$0+ipart)
		p=p-1
		FLDI(1,ipart); FSB(4,1); FML(4,2)
		if p ls 0 then [
			if p eq -1 then Puts(s,$.)
			FML(3,2)
			if FCM(4,3) eq -1 then break //fuzz
		]
	]
	if q ne 0 then
		[
		Puts(s,$E);
		Wns(s,q)
		]
	] //Really work
	for i=1 to 4 do FLDV(i,v+4*i)
]