Question

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C programming division

I’m trying to calculate the period of accelerometer updates using a user entered frequency.

this is my code:

double interval = 1/Freq;

interval = period

Freq is an int set by the user.

The problem I’m having is lets say I set Freq to 2Hz so the interval should be 0.5 but instead interval is 0.0000000 why is this? Can I do anything to change it without changing Freq to a double?

Answer 1

You are using integer division: (both 1 and Freq are integers). So the result will be an integer, and more exactly 0 in this case.

You can do something like this:

double interval = 1.0 / Freq;

Or

double interval = 1 / (double)Freq;