Float problem?

[lexy0202]

Hi all,

I'm trying to create a unit converter, one of the things it does is temperature conversion.

So the formula for farenheit is f=(c*(9/5))+32

If I run my code with a value of 12, i get 44, however when I do it in spotlight calculator or in the apple converter I get 53.6.

My problem, I have now worked out after splitting up the formula and breakpointing it, is that it says 9/5 = 1, whereas it clearly equals 1.8. For some reason my floats are being rounded (or floored in this case)?? - Should I be using a double or something??

here is my method (split up for debug purposes):

- (float)celsiusToFarenheit:(float)c {
    float divider = 9/5;
    float firstPart = c*divider;
    float ans = firstPart+32;
    return ans;
}

Thanks in advance,

Alex

EDIT: Sorry have now solved it requires me to put 9.0/5.0 instead of 9/5

[baja_yu]

9 and 5 are integers so / is integer division. Try 9.0f/5.0f. Also, if you are hardcoding values for the division, why do it at all, why don't you just hardcode 1.8?

[JohnnyC]

Does changing 9/5 to 9.0f/5.0f help?

*edit, beaten to it