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Iteration Announcements Return Return Statements A return - PowerPoint PPT Presentation

Aug 23, 2023 •153 likes •234 views

Iteration Announcements Return Return Statements A return statement completes the evaluation of a call expression and provides its value f(x) for user-defined function f : switch to a new environment; execute f's body return statement within f :

  1. Iteration

  2. Announcements

  3. Return

  4. Return Statements A return statement completes the evaluation of a call expression and provides its value f(x) for user-defined function f : switch to a new environment; execute f's body return statement within f : switch back to the previous environment; f(x) now has a value Only one return statement is ever executed while executing the body of a function def end (n, d): """Print the final digits of N in reverse order until D is found. >>> end(34567, 5) 7 6 5 """ while n > 0 : last, n = n % 10 , n // 10 print(last) if d == last: return None (Demo) � 4

  5. Self-Reference (Demo)

  6. Returning a Function Using Its Own Name � 6 http://pythontutor.com/composingprograms.html#code=def%20print_all%28k%29%3A%0A%20%20%20%20print%28k%29%0A%20%20%20%20return%20print_all%0A%20%20%20%20%0Aprint_all%281%29%283%29%285%29&cumulative=true&curInstr=0&mode=display&origin=composingprograms.js&py=3&rawInputLstJSON=%5B%5D http://pythontutor.com/composingprograms.html#code=def%20print_sums%28n%29%3A%0A%20%20%20%20print%28n%29%0A%20%20%20%20def%20next_sum%28k%29%3A%0A%20%20%20%20%20%20%20%20return%20print_sums%28n%2Bk%29%0A%20%20%20%20return%20next_sum%0A%0Aprint_sums%281%29%283%29%285%29&cumulative=true&curInstr=0&mode=display&origin=composingprograms.js&py=3&rawInputLstJSON=%5B%5D

  7. Function Example: Sounds

  8. WAV Files A triangle wave is the simple wave The Waveform Audio File Format form with the most pleasing sound encodes a sampled sound wave (Demo) � 8 https://en.wikipedia.org/wiki/Triangle_wave 
 https://en.wikipedia.org/wiki/Sampling_(signal_processing)

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