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Message: [QUOTE="John Gordon, post: 5021181"] This expression: (9/5) is composed entirely of integers, therefore it is computed using integer math, which discards the fractional part and evaluates to 1. So your program is really doing this calculation: fahr = -17 * 1 + 32 Which evaluates to 15. To fix this behavior, get in the habit of adding .0 after any number that you want to be treated as a float, like so: fahr = celsius * (9.0/5.0) + 32.0; This will give the correct results. (Your second example works because without the parentheses, the first operation is to multiply celsius by 9. One of those numbers is a float, so the calculation is done as a float. Then that result is divided by five, and again one of the numbers is a float, so the calculation is done as a float.) [/QUOTE]