PPT Slide

1.39

FINDING THE INTEGERS FROM

I DOWN TO ZERO

( defun tozero ( i )

( if ( zerop i ) '( 0 )

( cons i ( tozero ( 1- i ) ) ) ) )

( tozero 3 )

( cons 3 ( tozero 2 ) )

( cons 2 ( tozero 1 ) )

( cons 1 (tozero 0 ) )

( 0 )

( 1 0 )

( 2 1 0 )

( 3 2 1 0 )

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