Super-Easy Code Block Toggling

This nice trick extends into:
 

//*/
block 1
/*/
block 2; // commented out
/*/
block 3;
/*/
block 4; // commented out
//*/

 
and removing the first slash gives inverted alternation:
 

/*/
block 1; // commented out
/*/
block 2;
/*/
block 3; // commented out
/*/
block 4;
//*/

 
This enables you to alternate between odd and even sequential blocks :). It will extend to infinite count of blocks! Even more curious but sometimes usefull nonetheless, alternation can be switched wherever you like:
 

/*/
block 1; // commented out
/*/
block 2;
/*/
block 3; // commented out
/*/
block 4;
/*/
block 5; // commented out
/*/
block 6;
//*/

 
can be switched into:
 

/*/
block 1; // commented out
/*/
block 2;
/*/
block 3; // commented out
/*/
block 4;
//*/
block 5;
/*/
block 6; // commented out
//*/

:D ILa