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How to input float value?

 
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rog9001
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PostPosted: Sat Nov 26, 2016 10:19 am    Post subject: How to input float value? Reply with quote
what do I use to input a float value?

%x - Hex

%d - Decimal

%a - letter

. - any (but doesn't work)

which one do use?

Last edited by rog9001 on Sat Nov 26, 2016 11:03 am; edited 1 time in total
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ParkourPenguin
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PostPosted: Sat Nov 26, 2016 10:42 am    Post subject: Reply with quote
Where did you get the idea %a is for strings?

If you're trying to print a number to the screen, use %f with string.format. It mostly follows the same rules as the C function printf with some minor changes (namely *, h, L, l, n, and p were removed and q was added).
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rog9001
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PostPosted: Sat Nov 26, 2016 10:54 am    Post subject: Reply with quote
ParkourPenguin wrote:
Where did you get the idea %a is for strings?


is not string. I meant letter.
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Corroder
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PostPosted: Wed Nov 30, 2016 2:37 am    Post subject: Reply with quote
Code:

--converts a number into float
local function tofloat(x)
  if x==0 then return 0 end
  local s = 1
  if x>=0x80000000 then
     s = -1
     x=x-0x80000000
  end
  local e = math.floor(x/0x800000)-127
  local m=(x%0x800000)/0x800000+1
  return s*(2^e)*m
end


--- test
a=tonumber('1000')
a=tofloat(a)
print(a)

5.8781724033436e-039  --- result


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Dark Byte
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PostPosted: Wed Nov 30, 2016 5:06 am    Post subject: Reply with quote
dwordToByteTable followed by byteTableToFloat is probably easier, but i doubt this is what rog9001 meant
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Corroder
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PostPosted: Wed Nov 30, 2016 9:10 am    Post subject: Reply with quote
from corona lab
Code:

print( string.format( "%e, %E", math.pi, math.pi ) )        --> exponent: 3.141593e+00, 3.141593E+00
print( string.format( "%f, %g", math.pi, math.pi ) )        --> float and compact float: 3.141593, 3.14159
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