INTERVIEW QUESTIONS PROGRAMMING LANGUAGES C DETAILS

Question: What are enumerations?

Answer: enumerations is one type of user defined data type

enumerations is one type of user defined data type Source: CoolInterview.com

Enums are group of symbolic constant each having some integer value.

enum(PASS_MARK=60,MERIT_MARK=70)

defines two symbolic constant PASS_MARK and MERIT_MARK as 60 and 70,- it could be done with #define as well.

However without specific values ,- the values are assigned automatically ,- starting with 0 for the first element and 1 for the second, 3 for the second etc.

In case if we state a number for the first element then it will increment the value of each consecutive elemts with '1'.

enum(MON=1,TUE,WED,THU,FRI,SAT,SUN);

gives the values of 1-7 to the names of days. Source: CoolInterview.com

enumerations can be used in place of a macros for example let us consider an example where a function is failing for many reasons like array out of bounds, divide by zero ,and memory allocation failure
when you call such a function and if something goes wrong you may not know for what reason exactly in that case you can make an enum like
enum error
{
ARRAY_OUT =0,
MEMORY_FAIL,
DIVIDE_ZERO
}
and so on instead of defining each one by macro
Then based on return value it would be easy to locate eror . And ofcourse it is a user defined type.The values assigned will be from 0 to the number of elements present . you can also assign different values in between like
enum week {
sunday, monday, tuesday=4,wednesday,thursaday}
then wednesday and thursday would have a value of 5 and 6

Source: CoolInterview.com

Enums are group of symbolic constant each having some integer value.

enum(PASS_MARK=60,MERIT_MARK=70)

defines two symbolic constant PASS_MARK and MERIT_MARK as 60 and 70,- it could be done with #define as well.

However without specific values ,- the values are assigned automatically ,- starting with 0 for the first element and 1 for the second, 3 for the second etc.

In case if we state a number for the first element then it will increment the value of each consecutive elemts with '1'.

enum(MON=1,TUE,WED,THU,FRI,SAT,SUN);

gives the values of 1-7 to the names of days. Source: CoolInterview.com

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