Two ‘==’ equality operators in same ‘if’ condition are not working as intended

by 
  if ( (i == j) == k )

  i == j -> true -> 1 
  1 != 123

To avoid that:

 if ( i == j && j == k ) {

Don’t do this:

 if ( (i==j) == (j==k))

You’ll get for i = 1, j = 2, k = 1 :

 if ( (false) == (false) )

… hence the wrong answer 😉

More Related Contents:

  1. Where are static variables stored in C and C++?
  2. What is the difference between the dot (.) operator and -> in C++? [duplicate]
  3. What does the question mark character (‘?’) mean in C++?
  4. What’s the difference between __PRETTY_FUNCTION__, __FUNCTION__, __func__?
  5. Implementing comparison operators via ‘tuple’ and ‘tie’, a good idea?
  6. how does array[100] = {0} set the entire array to 0?
  7. How to change mode from c++98 mode in Dev-C++ to a mode that supports C++0x (range based for)?
  8. What is special about numbers starting with zero?
  9. Best compiler warning level for C/C++ compilers? [closed]
  10. C++ [] array operator with multiple arguments?
  11. Overloading friend operator
  12. Do unused functions get optimized out?
  13. Making operator
  14. Can I separate C++ main function and classes from Objective-C and/or C routines at compile and link?
  15. What is difference between sjlj vs dwarf vs seh?
  16. Template within template: why “`>>’ should be `> >’ within a nested template argument list”
  17. The copy constructor and assignment operator
  18. The tilde operator in C
  19. Update GCC on OSX
  20. Inadvertent use of = instead of ==
  21. Understanding stack frame of function call in C/C++? [closed]
  22. Why is the phrase: “undefined behavior means the compiler can do anything it wants” true?
  23. Template instantiation details of GCC and MS compilers
  24. What is the value category of the operands of C++ operators when unspecified?
  25. C++ string literal data type storage
  26. c++ sizeof() of a class with functions
  27. What is the difference between “::” “.” and “->” in c++ [duplicate]
  28. What does ‘**’ mean in C?
  29. Does the unary + operator have any practical use?
  30. _iterator_debug_level value ‘0’ doesn’t match value ‘2’

Leave a Comment