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Python Discussion Thread
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Mar 25th, 2006

Weird problem with float or double....

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simple problem....but I have no clue why its not working.....

Python Syntax (Toggle Plain Text)
if (w[0] > m[1]):
      temp = ((w[0]-m[1])/w[0])*100
      print temp
if (w[0] > m[1]):
      temp = ((w[0]-m[1])/w[0])*100
      print temp

For some reason temp is always 0.........I want a double percentage difference between the two values....

Please guys..help me out here......after 500 lines of code ...I am stuck here......my assignment is due tonight.....

how the hell do I get a float value?

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shafter111

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Newbie Poster

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6 posts
since Feb 2006

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Mar 25th, 2006

Re: Weird problem with float or double....

Hi shafter111,

If you are dividing an integer by some other number and you want the quotient to be a float, you need to cast the integer to a float. In other words:

Python Syntax (Toggle Plain Text)
a, b = 8, 3
temp = ((a-b)/a)*100     # Gives you zero
a, b = 8, 3
temp = ((a-b)/a)*100     # Gives you zero

While:

Python Syntax (Toggle Plain Text)
a, b = 8, 3
temp = (float(a-b)/a)*100     # Gives you 62.5
a, b = 8, 3
temp = (float(a-b)/a)*100     # Gives you 62.5

If you need greater precision than that provided by float(), look up the decimal module in the tutorial:

Guido van Rossum's Python Tutorial

Hope that helps.

G-Do

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Junior Poster

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146 posts
since Jun 2005

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Mar 25th, 2006

Re: Weird problem with float or double....

Thanks man......really appretiate the help
you rock!

shafter111

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Newbie Poster

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since Feb 2006

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