Page - 98 - in Programming for Computations – Python - A Gentle Introduction to Numerical Simulations with Python 3.6, Volume Second Edition

98 4 FunctionsandtheWritingofCode b) Typeinthecodeandruntheprogramtoconfirmthatyourpredictionsarecorrect. Filename:read_code_1.py. Exercise4.3:ReadingCode2 a) Read the followingcode and predict the printout producedwhen the programis executed. def f(x): if x < 2: return 0 else: return 2*x x = 0 for i in range(0, 4, 1): x += i print(x) for i in range(0, 4, 1): x += i*i print(x) for i in range(0, 4, 1): print(f(3*i-1)) b) Typeinthecodeandruntheprogramtoconfirmthatyourpredictionsarecorrect. Filename:read_code_2.py. Exercise4.4:Functions forCircumferenceandAreaofaCircle Writeaprogramthattakesacircleradiusrasinputfromtheuserandthencomputes the circumferenceC and areaAof the circle. Implement the computationsofC and Aas twoseparatefunctions thateach takesras inputparameter.PrintCandA to the screenalongwithanappropriate text.Run theprogramwith r=1andconfirmthat youget the rightanswer. Filename:functions_circumference_area.py. Exercise4.5:FunctionforAdding Vectors Writea functionadd_vectors that takes2vectors(arrayswithoneindexareoften calledvectors)aandbas inputargumentsandreturnsthevectorc,wherec=a+b. Place the function in a little program that calls the function and prints the result. Thefunctionshouldcheckthataandbhavethesamelength. Ifnot,Noneshouldbe returned.Confirmthatyour functionworksbycomparing tohandcalculations(i.e., just choosesomearraysand test). Filename:add_vectors.py.