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    Friday, November 27, 2020

    Enumeration

    Enumeration is a user defined datatype in C language. It is used to assign names to the integral constants which make a program easy to read and maintain.

    The keyword “enum” is used to declare an enumeration.

    The following is the way to define the enum in C:

    enum  flag{integer_const1, integer_const2,.....integter_constN}; 

    In the above declaration, enum named as flag containing 'N' integer constants is defined. The default value of integer_const1 is 0, integer_const2 is 1, and so on.

    If we do not explicitly assign values to enum names, the compiler by default assigns values starting from 0. 

    Example:

    enum fruits{mango, apple, banana, papaya}; 

    The default value of mango is 0, apple is 1, banana is 2, and papaya is 3.

    To change these default values, then :

    enum fruits{ mango=2, apple=1, banana=5, papaya=7}; 

    Variables of type enum can also be defined. They can be defined in two ways:

    enum  week{Mon, Tue, Wed};

    enum  week  day;

    // Or

    enum  week{Mon, Tue, Wed}day;

     

    An example program to demonstrate working of enum in C

    #include<stdio.h>

     enum week{Mon, Tue, Wed, Thur, Fri, Sat, Sun};

     void main()

    {

        enum  week   day;

        day = Wed;

        printf("%d",day);  

     

    Example 2:

    #include <stdio.h>

    enum day {sunday = 1, monday, tuesday = 5, wednesday, thursday = 10, friday, saturday};

     void main()

    {

    printf("%d %d %d %d %d %d %d", sunday, monday, tuesday,wednesday, thursday, friday, saturday);

    }

    Output:

    1  2  5  6  10  11  12

    Note: We can assign values to some name in any order. All unassigned names get value as value of previous name plus one.

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