enum.c

This file, enum.c, is a simple C program that demonstrates the use of an enumeration type. Here's a breakdown of the code:

  1. Header Inclusion:

    #include <stdio.h>

    The stdio.h library is included for input and output functions, specifically for using printf.

  2. Enumeration Declaration:

    enum month{jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec};

    An enumeration type month is defined, representing the months of the year. The values in the enumeration are implicitly assigned integer values starting from 0 (jan = 0, feb = 1, ..., dec = 11).

  3. Function Definition:

    enum month get_month(enum month m) {
    return(m);
}

    The function get_month takes an argument of type enum month and simply returns the same value. It's a minimal example to show how an enumeration can be passed to and returned from a function.

  4. Main Function:

    int main()
{
    printf("%u\n", get_month(apr));
    return 0;
}

    The main function:

    • Calls get_month with the apr enumeration value (which corresponds to 3, assuming 0-based indexing),
    • Prints the returned value as an unsigned integer (%u format specifier).
    • Returns 0 to indicate successful execution.

Output:

When this program is run, it will output:

3

This corresponds to the integer value of the apr enumeration.

Purpose:

This program is essentially a learning exercise to demonstrate the basics of declaring and using enumerations in C. It introduces how to:

  • Create an enumeration,
  • Pass an enumerated value to a function,
  • Return an enumerated value from a function, and
  • Print the integer representation of an enumerated value.