Detemining the size of a Class Object

-
There are many factors that decide the size of an object of a class in C++. These factors are:
  1. Size of all non-static data members
  2. Order of data members
  3. Byte alignment or byte padding
  4. Size of its immediate base class
  5. The existence of virtual function(s) (Dynamic polymorphism using virtual functions).
  6. Compiler being used
  7. Mode of inheritance (virtual inheritance)

Comments

Post a Comment

Popular posts from this blog

Three mislabeled Jar

-
Problem:  Another term for the same problem is Jelly Beans Problem. Mostly asked in Interview as Puzzle. Suppose you have three jars. One jar contains Apple, another jar contains Orange and third jar contains mixture of both the fruits. You have to fix the labels of jars by picking up as many fruits as you want from each jar. What is the minimum number of fruits that you have to pick and from which jars to correctly label them ? Solution:  As all jars are labeled incorrectly. So, if you pick one fruit from jar label Apple+Oranges, then whatever fruit comes be it Apple or Orange, then label that jar with the name of that fruit. Lets say orange come out of it, then label jar with Orange which was initially labelled as Apple+Orange. Now, jar labeled with Orange can be jar of either apples or mixture of fruits and jar labeled with Apple can be jar of either apples or mixture of fruits but jar labeled with Apple can't be labeled with Apple so it has to be jar of Apple+Orange. ...
Read more

Difference between Macro And function

-
Image
In C (and C++) a macro is a preprocessor directive. This means that before your program starts compiling it will go through and process all your macros. Macros are useful because They can make your program easier to read They can improve efficiency (as they can be calculated at compile time) They can shorten long or complicated expressions that are used a lot.  Disadvantages: Expand the size of your executable Can flood your name space if not careful. For example, if you have too many preprocessor macros you can accidentally use their names in your code, which can be very confusing to debug. The compilation and execution process of C can be divided in to multiple steps: Preprocessing - Using a Preprocessor program to convert C source code in expanded source code. "#includes" and "#defines" statements will be processed and replaced actually source codes in this step. Compilation - Using a Compiler program to convert C expanded source to assembly ...
Read more