Need quick help with C programming language!

25. May 2010 - 10:16

#1

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Joined: Nov 2005

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Re: Need quick help with C programming language!

I'm a bit rusty on C but this should work :

float t;
t = (float) ( (5.0f*x - 2.0f*y) / 7.0f*z)

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25. May 2010 - 10:22

#2

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Joined: Oct 2007

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Re: Need quick help with C programming language!

Ty, u saved my best friend

25. May 2010 - 11:14

#3

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Joined: Feb 2010

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Re: Need quick help with C programming language!

and make sure that x,y,z are also floats, else do a cast. Also z should never be zero!

25. May 2010 - 12:08

#4

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Joined: Oct 2009

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Re: Need quick help with C programming language!

there's an error: if the divider is 7z (7 multiplied by z), then should be:
t = (float) ( (5.0f*x - 2.0f*y) / (7.0f*z)); - feel the difference
this is because multiplication operators in C (* / %) are executed left-to-right (they have equal rank), so we must enclose last operand (7z) in brackets to force multiplication be calculated before division.
cheers

edit: also, you don't need that float cast - it's done automatically since your var is float. and all the subexpressions are at least float in this case.

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25. May 2010 - 13:43

#5

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Joined: Feb 2010

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Re: Need quick help with C programming language!

Yes, the braces are necessary indeed, good finding! The casts aren't explicitly necessary, yes, they are just good practice so you could leave them out!