Question

This is my program in C. I should be able to print out Monday, Tuesday and Wednesday. However, I am not sure what I am doing wrong. Please tell me.

So far I get these errors:

warning: ‘enum day’ declared inside parameter list will not be visible outside of this definition or declaration

const char* DayToString(enum color x)// I guess this is just a warning, nothing wrong

error: parameter 1 (‘x’) has incomplete type

const char* DayToString(enum color x) //I would assume that color is the type

error: expected expression before ‘day’

MyMonday = day(j);

          ^~~~~

typedef enum {Monday, Tuesday, Wednesday, Thursday, Friday} day; //declare an day enum

                                day MyMonday;

                                day MyTuesday;

                                day MyWednesday;

                               

                               

                const char* DayToString(enum day x) //create function DayToString that I can use later to print a day

                                {

                                                switch (x)

                                                {

                                                                case Monday : return " Monday";

                                                                case Tuesday: return " Tuesday ";

                                                                case Wednesday: return " Wednesday ";

                                                                case Thursday: return " Thursday ";

                                                                case Friday: return " Friday ";

                                                }

                                }

void main(){

                int j = 1; //declare int j that I can use to print Monday

                MyMonday = day(j);

                int y = 2;

                MyTuesday = day(y);

                int z = 5;

                MyWednesday = day(z);

               

                                                               

                                printf("\n Color #1: %s", DayToString(MyMonday));// should print Monday

                                printf("\n Color #1: %s", DayToString(MyTuesday));

                                printf("\n Color #1\n: %s", DayToString(MyWednesday));

                }

Answer 1

#include<stdio.h>

typedef enum {Monday, Tuesday, Wednesday, Thursday, Friday} day; //declare an day enum

day MyMonday;
day MyTuesday;
day MyWednesday;

/**
 * Here you used "enum day x" as a parameter but since you have already typedefed enum above as day.
 * That is why wherever you write "day" it means "enum day", therefore, "enum day x" would mean "enum enum day x"
 * and that's invalid!
 */
const char* DayToString(day x) //create function DayToString that I can use later to print a day
{
    switch (x)
    {
        case Monday : return " Monday";
        case Tuesday: return " Tuesday ";
        case Wednesday: return " Wednesday ";
        case Thursday: return " Thursday ";
        case Friday: return " Friday ";
    }
}

int main(){
    int j = 1; //declare int j that I can use to print Monday
    MyMonday = (day)j;
    int y = 2;
    MyTuesday = (day)y;
    int z = 3;
    MyWednesday = (day)z;
    printf("\n Color #1: %s", DayToString(MyMonday));// should print Monday
    printf("\n Color #1: %s", DayToString(MyTuesday));
    printf("\n Color #1: %s", DayToString(MyWednesday));
}

SAMPLE OUTPUT:

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