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V6061. The used constant value is repre…
Analyzer diagnostics
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V6061. The used constant value is represented by an octal form.

23 Oct 2018

The analyzer has detected a suspicious constant in octal form. This warning is output if there are no other octal constants nearby. Such "lone" octal constants are often errors.

Using octal constants is not a mistake in itself. They are a convenient tool for bit manipulation and are used in code that deals with networks or external devices. However, an average programmer does not use this notation often and may forget that adding a 0 before a decimal number turns that number into an octal one.

Consider the following example:

void compute(int red, int blue, int green)
{
  int color = 2220 * red +
              7067 * blue +
              0713 * green;

  // ...
}

The error is not easy to notice in code like that, but it is still there. Here, the last constant "0713" is written in octal form and its actual value is 459, not 713. Fixed code:

void compute(int red, int blue, int green)
{
  int color = 2220 * red +
              7067 * blue +
               713 * green;

  // ...
}

As mentioned earlier, this warning is triggered only by "lone" octal constants, with no other such constants nearby. For that reason, the analyzer considers the following code safe and keeps silent:

short bytebit[] = {01, 02, 04, 010, 020, 040, 0100, 0200 };

This diagnostic is classified as:

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