What is the difference between these (bCondition == NULL) and (NULL==bCondition)?

by

The use of NULL == condition provides more useful behaviour in the case of a typo, when an assignment operator = is accidentally used rather then the comparison operator ==:

if (bCondition = NULL)  // typo here
{
 // code never executes
}

if (NULL = bCondition) //  error -> compiler complains
{
 // ...
}

C-compiler gives a warning in the former case, there are no such warnings in many languages.

More Related Contents:

  1. Can you tell me specific what this program is doing? [closed]
  2. Is `&variable = null;` possible? [closed]
  3. If statement – C++
  4. C++ use if else
  5. Is (4 > y > 1) a valid statement in C++? How do you evaluate it if so?
  6. Is C++ context-free or context-sensitive?
  7. Why do people use __ (double underscore) so much in C++
  8. What are the advantages of list initialization (using curly braces)?
  9. if (cin >> x) – Why can you use that condition?
  10. C++, variable declaration in ‘if’ expression
  11. Can the template parameters of a constructor be explicitly specified?
  12. Why is using the function name as a function pointer equivalent to applying the address-of operator to the function name?
  13. Checking for NULL pointer in C/C++ [closed]
  14. Math-like chaining of the comparison operator – as in, “if ( (5
  15. What’s this C++ syntax that puts a brace-surrounded block where an expression is expected?
  16. If always returns true [duplicate]
  17. How to avoid “if” chains?
  18. Benefits of ternary operator vs. if statement
  19. What does a backslash in C++ mean?
  20. How typedef works for function pointers
  21. Defining a variable in the condition part of an if-statement?
  22. How to break out of a loop from inside a switch?
  23. Why does this call the default constructor?
  24. Why does cin command leaves a ‘\n’ in the buffer?
  25. if statement not working right?
  26. Do I need to put constexpr after else-if?
  27. Why do some people prefer “T const&” over “const T&”?
  28. Purpose of a “.f” appended to a number?
  29. What does ‘**’ mean in C?
  30. if / else at compile time in C++?

Leave a Comment