Why use hex?

by

In both cases you cite, the bit pattern of the number is important, not the actual number.

For example,
In the first case,
j is going to be 1, then 2, 4, 8, 16, 32, 64 and finally 128 as the loop progresses.

In binary, that is,

0000:0001, 0000:0010, 0000:0100, 0000:1000, 0001:0000, 0010:0000, 0100:0000 and 1000:0000.

There’s no option for binary constants in C (until C23) or C++ (until C++14), but it’s a bit clearer in Hex:
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, and 0x80.

In the second example,
the goal was to remove the lower two bytes of the value.
So given a value of 1,234,567,890 we want to end up with 1,234,567,168.
In hex, it’s clearer: start with 0x4996:02d2, end with 0x4996:0000.

More Related Contents:

  1. How do you convert decimal in integer to hexadecimal in integer? [closed]
  2. C++ convert hex string to signed integer
  3. Converting a hex string to a byte array
  4. Integer to hex string in C++
  5. C++ convert string to hexadecimal and vice versa
  6. C++ cout hex values?
  7. C++: Converting Hexadecimal to Decimal
  8. What is the underlying type of a c++ enum?
  9. Decimal to hex conversion c++ built-in function
  10. Getting hex through Cin
  11. Using C++ to edit the registry
  12. Can you remove elements from a std::list while iterating through it?
  13. When should std::move be used on a function return value? [duplicate]
  14. Why do I get an infinite loop if I enter a letter rather than a number? [duplicate]
  15. Function passed as template argument
  16. What techniques can be used to speed up C++ compilation times?
  17. Why override operator()?
  18. OpenCV C++/Obj-C: Advanced square detection
  19. Overloaded lambdas in C++ and differences between clang and gcc
  20. boost zip_iterator and std::sort
  21. xxxxxx.exe is not a valid Win32 application
  22. Two phase name lookup for C++ templates – Why?
  23. C++ Boost: undefined reference to boost::system::generic_category()
  24. What should std::vector::data() return if the vector is empty?
  25. How to detect region of large # of white pixels using OpenCV?
  26. c++ how to use select to see if a socket has closed
  27. Missing C++ header after updating OSX Command Line Tools 6.3
  28. sqlite3_exec() Callback function clarification
  29. Does setprecision in c++ round? If so why am I seeing this?
  30. Overload resolution with ref-qualifiers

Leave a Comment