EBK ACTIVITIES MANUAL FOR PROGRAMMABLE
EBK ACTIVITIES MANUAL FOR PROGRAMMABLE
5th Edition
ISBN: 8220102795983
Author: Petruzella
Publisher: YUZU
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Chapter 14, Problem 8RQ
Program Plan Intro

Control systems:

  • A control system refers to a system that is capable of managing, commanding, directing, or regulating the behavior of other machines or devices.
  • Generally, a feedback controller is used for controlling a process or operation automatically.
  • It has a wide range of applications including home heating controller, industrial control systems and many such.

On/off control:

  • The on/off control makes use of a feedback controller which switches abruptly between two states.
  • It is used to keep the final control element in the system in either on or off state.
  • A simple bi-metallic domestic thermostat can be related as an on-off controller.

Proportional control:

  • Proportional control refers to a linear feedback control system.
  • It is used to keep the final control element in intermediate positions between the on-off controls.
  • It is more complex than an on-off control system.
  • Examples of proportional controller include toilet bowl float proportional value and fly-ball governor.

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5. Word FrequencyWrite a program that reads the contents of a text file. The program should create a dictio-nary in which the keys are the individual words found in the file and the values are the number of times each word appears. For example, if the word “the” appears 128 times, the dictionary would contain an element with 'the' as the key and 128 as the value. The program should either display the frequency of each word or create a second file containing a list of each word and its frequency.
3.) File Encryption and DecryptionWrite a program that uses a dictionary to assign “codes” to each letter of the alphabet. For example: codes = { ‘A’ : ‘%’, ‘a’ : ‘9’, ‘B’ : ‘@’, ‘b’ : ‘#’, etc . . .}Using this example, the letter A would be assigned the symbol %, the letter a would be assigned the number 9, the letter B would be assigned the symbol @, and so forth. The program should open a specified text file, read its contents, then use the dictionary to write an encrypted version of the file’s contents to a second file. Each character in the second file should contain the code for the corresponding character in the first file. Write a second program that opens an encrypted file and displays its decrypted contents on the screen.
Returns an US standard formatted phone number, in the format of      (xxx) xxx-xxxx           the AreaCode, Prefix and number being each part in order.           Testing Hint: We be exact on the format of the number when      testing this method. Make sure you think about how to convert      33 to 033 or numbers like that when setting your string format. Reminder      the %02d - requires the length to be 2, with 0 padding at the front if a single      digit number is passed in.

Chapter 14 Solutions

EBK ACTIVITIES MANUAL FOR PROGRAMMABLE

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