C++ Language INTERVIEW QUESTION & ANSWERS
| 66. |
What is the use of sizeof() operator? |
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The sizeof () operator is used to find the size of a variable or the sizeof a data type in terms of the number of bytes. |
| 67. |
What is copy constructor? |
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Copy constructor is a constructor function with the same name as the class and used to make deep copy of objects. |
| 68. |
What is default constructor? |
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A default constructor is a constructor that either has no parameters, or if it has parameters, all the parameters have default values. |
| 69. |
What is static variable? |
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Static variables are defined within a function and they have the same scope rules of the automatic variables but in the case of static variables, the contents of the variables will be retained throughout the program. |
| 70. |
What is register variable? |
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Automatic variables are stored in the memory. As accessing a memory location takes time (much more time than accessing one of the machine's registers), one can make the computer to keep only a limited number of variables in their registers for fast processing. Whenever some variables are to be read or repeatedly used, they can be assigned as register variables.
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