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Weird problem with float or double....

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Join Date: Feb 2006

Posts: 6

Reputation: shafter111 is an unknown quantity at this point

Solved Threads: 0

shafter111 shafter111 is offline

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Newbie Poster

Weird problem with float or double....

Mar 25th, 2006

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

 Help with Code Tags 
 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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Join Date: Jun 2005

Posts: 146

Reputation: G-Do is an unknown quantity at this point

Solved Threads: 28

G-Do

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Junior Poster

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

Mar 25th, 2006

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:

 Help with Code Tags 
 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:

 Help with Code Tags 
 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.

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