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Problem with calculation

Hi

I have been trying to use the equation:

int Temp;
   Temp = 680*((N-82)/(920-82));
   return Temp;

N=920 - I would expect temp would be 680 and the result is 680 which is correct

But when I tried to use other values below, I keep getting zero.

Then N - 900
Result: 0

adc_result - 700
result:0

adc_result - 500
result:0

adc_result - 300
result:0

adc_result - 100
result:0

I don't understand why this happened.

Arron

Parents

0 Karl Hamsher over 19 years ago

Assuming 'N' is an int, the subexpression ((N-82)/(920-82)) yields 0 for any value of 'N' less than 920. 680 * 0 = 0. You are using integer arithmetic, you know.
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0 Karl Hamsher over 19 years ago

Assuming 'N' is an int, the subexpression ((N-82)/(920-82)) yields 0 for any value of 'N' less than 920. 680 * 0 = 0. You are using integer arithmetic, you know.
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