PPT Slide

Let and Let*

The let and let* forms implement local variables.

( let ( ( parm1 init 1 )

( parm 2 init 2 )

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( parm m init m ) )

form1 ….. form n )

initializes variables parm1, parm2, …. , parmm to the values init1, init2, …. , initm and these variables are bound to the values in the scope of the let, which includes form1 …. formn .

( let ( ( x 10 ) ) ( print ( 1+ x ) ) ) 11

( setf x 5 )

( let ( ( x 10 ) ( y ( * x x ) ) ) 25

( print y ) )

( let* ( ( x 10 ) ( y ( * x x ) ) )

( print y ) ) 100

1.51

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