## number of digits `num-digits`: whole-number -> number Returns how many digits in the number. --- ## number of digits * Use conditional. * Base: answer of 1 --- ## number of digits ```racket (define (num-digits n) (cond [(< n 10) 1] [else ... ])) ``` --- ## number of digits * Use conditional. * Base: answer of 1 * Else: one more than ... --- ## number of digits Trick: * `(quotient number 10)` has one fewer digit ---