sub factorial(x)
var i,result=2

if x<=0 then
return 1
end if

if x<3 then
return x
end if

for i = 3 to x 
result=result*i
next

uo.print(str(x)+"! = "+str(result))
return result
end sub

sub XtoPowerY(x,y)

if not IsWholeNum(y) or y<0 or (x==0 and y==0) then
return 0
end if

var i,result=1

if y>0 then
 for i = 1 to y
 result=result*x
 next
else
return 1   
end if

uo.print(str(x)+"^"+str(y)+" = "+str(result))
return result
end sub

sub abs(x) 
    if (x < 0) then 
        x = -x 
    end if 
    return x 
end sub

sub SQRT(x)
if x<0 then
return 0
end if

var tmp=int(2*len(str(x)))
var result=XtoPowerY(2,tmp)

repeat
tmp=result
result=0.5*(result+x/result)
until abs(tmp-result)<0.00001
uo.print("sqrt("+str(x)+") = "+str(result))
return result
end sub

sub ln(x)
var i=0,y,tmp,result=0

if x>1 then

 y=(x-1)/(x+1)

 repeat
 tmp=result
 result=result+(XtoPowerY(y,i))/(i+1)
 i=i+2
 until (result-tmp)<0.0001 and i>3

 result=result*2*y
 uo.print("ln("+str(x)+") = "+str(result,3))
 return result

else
 if x<=0 then
    return 0
 else
    x=x-1
    repeat
    tmp=result
    result=result+((XtoPowerY(-1,i))*(XtoPowerY(x,i+1)))/(i+1)
    i=i+1
    until (tmp-result)<0.0001 and i>5
    uo.print("ln("+str(x)+") = "+str(result,3))
    return result
 end if
end if
end sub

sub lg(base,x)
var result,tmp
tmp=ln(base)
result=(ln(x)/tmp)
uo.print("lg("+str(base)+","+str(x)+") = "+str(result,2))
return result
end sub

sub IsWholeNum(num)
if (num-int(num)) == 0 then
uo.print("Is Whole Num")
return true
else
uo.print("Is Not Whole Num")
return false
end sub

Sub Math.Factorial()
Sub Math....

Sub Fibonacci(num)
   if num == 0 then
      return 0
   endif
   if num == 1 then
      return 1
   endif
   return Fibonacci(num-1)+Fibonacci(num-2)
endsub

sub factorial(x)
if x<=1 then
return 1
else
return x*factorial(x-1)
end if
end sub

sub XtoPowerY(x,y)
if y<=1 then
return x
else
return x*XtoPowerY(x,y-1)
end if
end sub