Jumping from one case to the default case in switch statement

switch(ch){
          case 'a':
                 //do something, condition does not match so go to default case
                 //don't break in here, and don't allow fall through to other cases.
          case 'b':
                 //..
          case 'c':
                 //..
          case '_':
                 //...
          default:
                 //
                 break;
}

In a switch statement like above one I enter case 'a', I break only if the condition inside it occurs, otherwise I want to jump to default case. Is there any other way of doing this rather than labels or gotos?