Question

I found following code in one of the frameworks we are using,

if (nValue + 0.01 > nLimit)
   nValue = nValue - 0.01;

if (((nValue+1) / (int)(nValue+1)) == 1)
      sprintf(szValue, "%0.0f", nValue);
   else
      sprintf(szValue, "%0.2f", nValue);

what is the meaning of this code

Answer 1

I’d suspect that the first part is a mistaken attempt to ensure nValue does not exceed nLimit. It possibly should be

if (nValue + 0.01 > nLimit)
   nValue = nLimit - 0.01;

In other words, if nValue is closer than 0.01 to the limit make it 0.01 less than the limit

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To explain how the second part works, it involves dividing a floating point number by the integer part of the number. If the number is an integer then the result will be 1

e.g.

23.00 / 23 = 1 - It's an integer
23.05 / 23 = 1.002 - It's not an integer

Adding 1 to each side is (as ufukgun noticed) to prevent devide by zero, but the devision is redundant as you could simply compare the float with the int

if (nValue == (int)nValue)