Defining enum data types

/* 1801.c: Defining enum data types */
#include <stdio.h>
/* main() function */
main()
{
    enum language {human=100, animal=50, computer};
    enum days{SUN,MON,TUE,WED,THU,FRI,SAT};

    printf("human: %d, animal: %d, computer: %d\n", human, animal, computer);
    printf("SUN: %d\n", SUN);
    printf("MON: %d\n", MON);
    printf("TUE: %d\n", TUE);
    printf("WED: %d\n", WED);
    printf("THU: %d\n", THU);
    printf("FRI: %d\n", FRI);
    printf("SAT: %d\n", SAT);

    return 0;
}