switch case error in program

[vead]

What's mistake in my program I just want to do it , if some one enter specific color then print specific statement for each color

#include <stdio.h>
int main(void)
{
 
    unsigned char favorite_color;
 
    printf("Please choose your favorite color: ");
    scanf("%d", &favorite_color);
 
    /* print out the result */
    switch (favorite_color)
    {
    case red:
        printf("your favorite color is Red");
        break;
    case green:
        printf("your favorite color is Green");
        break;
    case blue:
        printf("your favorite color is Blue");
        break;
    default:
        printf("you did not choose any color");
    }
 
    return 0;
}

output
hello.c: In function 'main':
hello.c:14:10: error: 'red' undeclared (first use in this function)
case red:
^~~
hello.c:14:10: note: each undeclared identifier is reported only once for each function it appears in
hello.c:17:10: error: 'green' undeclared (first use in this function)
case green:
^~~~~
hello.c:20:10: error: 'blue' undeclared (first use in this function)
case blue:
^~~~

[DRK]

The compiler tells exactly what the problem is - you provided some identifiers (red, green, blue) which were not previously declared. switch-case instruction handles only integer values, so you need to make those colour names integers, e.g.:

enum color
{
    red = 1,
    green = 2,
    blue = 3
};

You should also display those values so the user could choose from them.

printf("%d - red\n", red);
printf("%d - green\n", green);
printf("%d - blue\n", blue);

[vead]

The compiler tells exactly what the problem is - you provided some identifiers (red, green, blue) which were not previously declared. switch-case instruction handles only integer values, so you need to make those colour names integers, e.g.:

I understand switch case with enum . Actually I didn't want to use enum. I just wanted to make program where I will use only switch case statement. can you tell me how to make it without enum

[Salem]

Perhaps
#define red 0

Or
const int red = 0;

Or
case 0: