Computer Science Canada Not being able to use pow() |
| Author: | ihsh [ Mon Sep 06, 2010 8:42 pm ] | ||
| Post subject: | Not being able to use pow() | ||
It's me again. 
I was trying to write the code of a binary converter. But I always got strange outputs so I tested my codes and found out that the problem was with the function pow (). At first I thought it was a variable problem again, but it wasn't! I wrote a new program to test the function and the output was still zero.
Thanks for your time. |
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| Author: | michaelp [ Mon Sep 06, 2010 8:50 pm ] | ||||
| Post subject: | RE:Not being able to use pow() | ||||
The format specifier "%d" is for an integer, but the function "pow" returns a double. So, changing %d to %f will then print "8.000000" (or something similar). Changing that to "%.f" will then just print out 8. Also, using %d, you can use:
And you will also get 8. Here is a list of format specifiers in C: http://www.mekong.net/tech/printf.htm Also, when I compiled this using GCC, I got the
Not sure if you got that when you compiled your code. |
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| Author: | ihsh [ Mon Sep 06, 2010 9:20 pm ] |
| Post subject: | RE:Not being able to use pow() |
Thanks, program works now. 
Quote: Also, when I compiled this using GCC, I got the
code: warning: format ?%d? expects type ?int?, but argument 2 has type ?double Not sure if you got that when you compiled your code. No I didn't get any warning when compiling the code. |
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| Author: | DtY [ Tue Sep 07, 2010 3:41 pm ] | ||
| Post subject: | Re: RE:Not being able to use pow() | ||
michaelp @ Mon Sep 06, 2010 8:50 pm wrote: Also, when I compiled this using GCC, I got the I think that warning is only in pretty new versions of gcc.
Not sure if you got that when you compiled your code. e; Also, you should avoid using pow() unless the exponent rather large or a variable. a*a*a will be faster than pow(a,3). |
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