Sub MAIN
'	Program izracuna kvadratni koren pozitivnih in negativnih
' 	stevil z Newtonovo iteracijsko metodo in strojno natacnostjo
'	Opomba: SQRT (-1) = imaginarno stevilo "i"

'__________________zajem podatka ___________________________________

a = Val(Selection$()) : z = a
If a < 0 Then a = Abs(a) : T = 1
If (a) = 1 Then R$ = "1" : Goto IZPIS
If (a) = 0 Then R$ = "0" : Goto IZPIS

'____________izracun kvadratnega korena stevila a___________________

a0 = a + 1 : a1 = (a0 + a / a0) / 2
	While a0 <> a1
		a0 = a1 :	a1 = (a0 + a / a0) / 2
	Wend
rezultat = a1 : R$ = Str$(rezultat)

'____________zaokrozitev na N decimalk (npr.6)____________________
ZAOKROZEVANJE: N = 6

'________razdelitev na celi,decimalni in ekponentni del___________

dc = InStr(R$, ".") : exp = InStr(R$, "E") : If exp <> 0 Then exp$ = Mid$(R$, exp, Len(R$) - exp + 1) Else exp = Len(R$)
If dc > 1 Then R$ = LTrim$(Left$(Str$(rezultat), dc)) Else Goto IZPIS
dec1$ = Mid$(Str$(rezultat), dc + 1, exp - dc - 1)
If N = O And Val(Mid$(dec1$, 1, 1)) >= 5 Then K1 = Val(R$) : If K1 > 0 Then K1 = K1 + 1 Else K1 = K1 - 1
If K1 <> 0 Then R$ = Str$(K1) : Goto SKUPAJ
If Len(dec1$) < N And exp$ = "" Then dec1$ = Mid$(Str$(rezultat), dc + 1, exp - dc)
If Len(dec1$) > N Then dec2$ = Mid$(dec1$, N + 1, 1) : dec1$ = Mid$(dec1$, 1, N) : dec$ = ""
If Val(dec1$) = 0 Then dec$ = dec1$ : Goto SKUPAJ
If Val(dec2$) >= 5 Then
 	For x = 1 To N - 1 : dec$ = dec$ + Mid$(dec1$, x, 1) : Next : dec$ = dec$ + LTrim$(Str$(Val(Mid$(dec1$, N, 1)) + 1))
	Else
	dec$ = dec1$
End If
SKUPAJ:
If Len(dec$) < N Then For x = Len(dec$) To N - 1 : dec$ = dec$ + "0" : Next
R$ = R$ + dec$ + exp$

'__________z vklopom in izklopom REM izbiramo nacin izpisa_________

IZPIS:

Insert "sqrt " + Str$(z) + " = " + R$ + " "  : If T = 1 Then Insert "i "

REM WordRight : Insert " = " + R$ + " " : If T = 1 Then Insert "i (sqrt)" Else Insert " (sqrt) "

REM WordRight : CharRight 1 :  Insert Chr$(9) + R$  : If T = 1 Then Insert " i "

End Sub