In the example as given below 'a' behaves like a constant whereas the value named with 'x' can be modified (in the interaction window) as expected. Could you help me please to understand what happened by (set! x "Bob")?
Definition window #lang racket (define a "Hello") (define x "Hello") (set! x "Bob") Interaction window > (set! a 3) . . set!: assignment disallowed; cannot modify a constant constant: a > (set! x 9) > x 9
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