One principle that can help in debugging and maintaining code is abstraction. For example, in your fitness tracking app some of your existing functions have been written to both perform a calculation and print a message. But it's very possible that you'll decide to change either the calculation or the message in the future. It will be easier to go back and change this if you separate the calculation from the message. As an example, write a function that only does a portion of what your previous pacing function did. This function will be called calculatePace. It should take three Double arguments called currentDistance, totalDistance, and currentTime, and should return a Double that will represent the time at which the user will finish the run based on the user's current distance and time. call the function and print the return value. Now write a function called pacing that takes four Double arguments called currentDistance, totalDistance, currentTime, and goalTime. The function should also return a String, which will be the message to show the user. The function should call calculatePace, passing in the appropriate values, and capture the return value. The function should then compare the returned value to goalTime and if the user is on pace return "Keep it up!", and return "You've got to push it just a bit harder!" otherwise. Call the function and print the return value.
One principle that can help in debugging and maintaining code is abstraction. For example, in your fitness tracking app some of your existing functions have been written to both perform a calculation and print a message. But it's very possible that you'll decide to change either the calculation or the message in the future. It will be easier to go back and change this if you separate the calculation from the message. As an example, write a function that only does a portion of what your previous pacing function did. This function will be called calculatePace. It should take three Double arguments called currentDistance, totalDistance, and currentTime, and should return a Double that will represent the time at which the user will finish the run based on the user's current distance and time. call the function and print the return value. Now write a function called pacing that takes four Double arguments called currentDistance, totalDistance, currentTime, and goalTime. The function should also return a String, which will be the message to show the user. The function should call calculatePace, passing in the appropriate values, and capture the return value. The function should then compare the returned value to goalTime and if the user is on pace return "Keep it up!", and return "You've got to push it just a bit harder!" otherwise. Call the function and print the return value.
Programming Logic & Design Comprehensive
9th Edition
ISBN:9781337669405
Author:FARRELL
Publisher:FARRELL
Chapter2: Elements Of High-quality Programs
Section: Chapter Questions
Problem 1GZ
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How do I solve this exercise using Swift code? 6 of 6.
Transcribed Image Text:App Exercise - Separating Functions
Note
These exercises reinforce Swift concepts in the context of a fitness tracking app.
One principle that can help in debugging and maintaining code is abstraction. For example, in your fitness
tracking app some of your existing functions have been written to both perform a calculation and print a
message. But it's very possible that you'll decide to change either the calculation or the message in the
future. It will be easier to go back and change this if you separate the calculation from the message.
As an example, write a function that only does a portion of what your previous pacing function did. This
function will be called calculatePace. It should take three Double arguments called
currentDistance, totalDistance, and currentTime, and should return a Double that will
represent the time at which the user will finish the run based on the user's current distance and time. call
the function and print the return value.
Now write a function called pacing that takes four Double arguments called currentDistance,
totalDistance, currentTime, and goalTime. The function should also return a String, which will be
the message to show the user. The function should call calculatePace, passing in the appropriate values,
and capture the return value. The function should then compare the returned value to goalTime and if the
user is on pace return "Keep it up!", and return "You've got to push it just a bit harder!" otherwise. Call the
function and print the return value.
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