switch statement in C

Question

Is the following switch statement correct? I mean can i use constant and character literal in one switch case statement? It works in code but I am asking from good practices standpoint.

switch(arg[1]) {
    case '4':
        printf("value is 4\n");
        break;
    case '6':
        printf("value is 6\n");
        break;
    case 'M':
        printf("value is M\n");
        break;
    default:
        break;
}

Answer 1

It works in code but I am asking from good practices standpoint.

Yes, it's fine to use char variables and constants in switch statements. It's very common to see that, for example, to process command line arguments . char is an integer type, and switch works as well with char as with any other integer type.