switch Statements

Example: expand getopt processing
The use of fallthrough:
case 'a':
    fts_options |= FTS_SEEDOT;
    /* FALLTHROUGH */
case 'A':
    f_listdot = 1;
    break;
Defensive handling of default statements:
    switch (program) {
    case ATQ:
/* [...] */
    case BATCH:
        writefile(time(NULL), 'b');
        break;
    default:
        panic("Internal error");
        break;
    }