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V637. Two opposite conditions were enco…
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

V637. Two opposite conditions were encountered. The second condition is always false.

Aug. 27, 2012

The analyzer has detected a potential logic error in the program. The error is this: two conditional operators in a sequence contain mutually exclusive conditions.

Here are examples of mutually exclusive conditions:

  • 'A == B' and 'A != B';
  • 'B < C' and 'B > C';
  • 'X == Y' and 'X < Y';
  • etc.

This error usually occurs as a consequence of a misprint or poor refactoring. As a result, program execution logic is violated.

Consider an example of incorrect code:

if (A == B)
  if (B != A)
    B = 5;

In this case, the "B = 5;" statement will never be executed. Most likely, an incorrect variable is used in the first or in the second condition. We need to find out the program execution logic.

This is the fixed code:

if (A == B)
  if (B != C)
    B = 5;

This diagnostic is classified as:

You can look at examples of errors detected by the V637 diagnostic.

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