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V563. It is possible that this 'else' b…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
Additional information
Contents

V563. It is possible that this 'else' branch must apply to the previous 'if' statement.

Feb 11 2011

The analyzer detected a potential error in logical conditions: code's logic does not coincide with the code editing.

Consider this sample:

if (X)
  if (Y) Foo();
else
  z = 1;

The code editing disorientates you so it seems that the "z = 1" assignment takes place if X == false. But the 'else' branch refers to the nearest operator 'if'. In other words, this code is actually analogous to the following code:

if (X)
{
    if (Y)
      Foo();
    else
      z = 1;
 }

So, the code does not work the way it seems at first sight.

If you get the V563 warning, it may mean one of the two following things:

1) Your code is badly edited and there is no error actually. In this case you need to edit the code so that it becomes clearer and the V563 warning is not generated. Here is a sample of correct editing:

if (X)
  if (Y)
    Foo();
  else
    z = 1;

2) A logical error has been found. Then you may correct the code, for instance, this way:

if (X) {
  if (Y)
    Foo();
} else {
  z = 1;
}

This diagnostic is classified as:

You can look at examples of errors detected by the V563 diagnostic.

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