How to use nested switch construct

Use of nested switch construct:

Declaration :

switch (selection)

{ case 1 : statement sequence

switch (nes_swi)

{ case 1 : statement sequence

break;

case 2 : statement sequence

break;

}

case 2 : statement sequence

switch (nes_swi_2)

{ case 1 : statement sequence

break;

case 2 : statement sequence

break;

}