Justification

In the interest of readability.

Example 1

switch (option)
{ 
default: /* WRONG */
   /* any statement */
   break;
case 1:
   /* any statement */
   break;
}

Example 2

switch (option)
{ 
case 1: /* RIGHT */
   /* any statement */
   break;
default:
   /* any statement */
   break;
}