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moved and added checkpoint solutions to Chapter 5
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Chapter-4-Making-Decisions/Review Questions and Exercises/Programming Challenges/27.cpp
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| /******************************************************************** | ||
| * | ||
| * 27. Mobile Service Provider, Part 3 | ||
| * | ||
| * Months with 30 days have 720 hours, and months with 31 days | ||
| * have 744 hours. February, with 28 days, has 672 hours. You can | ||
| * calculate the number of minutes in a month by multiplying its | ||
| * number of hours by 60. Enhance the input validation of the | ||
| * Mobile Service Provider program by asking the user for the | ||
| * month (by name), and validating that the number of minutes | ||
| * entered is not more than the maximum for the entire month. | ||
| * Here is a table of the months, their days, and number of hours | ||
| * in each. | ||
| * | ||
| * ============================================================== | ||
| * Month Days Hours | ||
| * ------------------------------------------------------------- | ||
| * January 31 744 | ||
| * February 28 672 | ||
| * March 31 744 | ||
| * April 30 720 | ||
| * May 31 744 | ||
| * June 30 720 | ||
| * July 31 744 | ||
| * August 31 744 | ||
| * September 30 720 | ||
| * October 31 744 | ||
| * November 30 720 | ||
| * December 31 744 | ||
| * ============================================================== | ||
| * | ||
| * Jesus Hilario Hernandez | ||
| * February 28, 2018 | ||
| * | ||
| ********************************************************************/ | ||
| #include <iostream> | ||
| #include <iomanip> | ||
| #include <string> | ||
|
|
||
| using namespace std; | ||
| int main() | ||
| { | ||
| // Constant Variables | ||
| const float A_CHARGES = 39.99, | ||
| A_ADD = .45, | ||
| A_MINS = 450, | ||
| B_CHARGES = 59.99, | ||
| B_ADD = .40, | ||
| B_MINS = 900, | ||
| C_CHARGES = 69.99, | ||
| _30_DAYS = 30, | ||
| _31_DAYS = 31, | ||
| _28_DAYS = 28, | ||
| NUM_MINS_IN_28_DAYS = 672 * 60, | ||
| NUM_MINS_IN_30_DAYS = 720 * 60, | ||
| NUM_MINS_IN_31_DAYS = 744 * 60; | ||
|
|
||
|
|
||
| // Variables | ||
| char menu_choice; // Menu selection (menu_choice) | ||
| string month; // User (month) | ||
|
|
||
| // Display menu | ||
| cout << "\nPackage A: For $39.99 per month 450 minutes are provided." << endl; | ||
| cout << " Additional minutes are $0.45 per minute." << endl; | ||
| cout << "Package B: For $59.99 per month 900 minutes are provided." << endl; | ||
| cout << " Additional minutes are $0.40 per minute." << endl; | ||
| cout << "Package C: For $69.99 per month unlimited minutes provided.\n" << endl; | ||
|
|
||
| // Ask for package customer purchased | ||
| cout << "Choose package: "; | ||
| cin >> menu_choice; | ||
| cout << endl; | ||
|
|
||
| // Validate menu_choice | ||
| switch (menu_choice) | ||
| { | ||
|
|
||
| // Variables | ||
| int counter; | ||
| float total_charges_A, | ||
| total_charges_B, | ||
| total_charges_C; | ||
|
|
||
| case 'a': | ||
| case 'A': | ||
| case 'B': | ||
| case 'b': | ||
| case 'c': | ||
| case 'C': | ||
|
|
||
| // Ask for (month) | ||
| cout << "Choose a month" << endl; | ||
| cin >> month; | ||
|
|
||
| // Validate (month) | ||
| if (month == "January" || month == "january") | ||
| counter = _31_DAYS; | ||
| else if (month == "February" || month == "february") | ||
| counter = _28_DAYS; | ||
| else if (month == "March" || month == "march") | ||
| counter = _31_DAYS; | ||
| else if (month == "April" || month == "april") | ||
| counter = _30_DAYS; | ||
| else if (month == "May" || month == "may") | ||
| counter = _31_DAYS; | ||
| else if (month == "June" || month == "june") | ||
| counter = _30_DAYS; | ||
| else if (month == "July" || month == "july") | ||
| counter = _31_DAYS; | ||
| else if (month == "August" || month == "august") | ||
| counter = _31_DAYS; | ||
| else if (month == "September" || month == "september") | ||
| counter = _30_DAYS; | ||
| else if (month == "October" || month == "october") | ||
| counter = _31_DAYS; | ||
| else if (month == "November" || month == "november") | ||
| counter = _30_DAYS; | ||
| else if (month == "December" || month == "december") | ||
| counter = _31_DAYS; | ||
| else | ||
| { | ||
| // Explain input error (month) | ||
| cout << "Invalid month. Check spelling, rerun program "; | ||
| cout << "and try again." << endl; | ||
| } | ||
|
|
||
| // Check if (counter) is between 28 and 31 | ||
| if (counter >= _28_DAYS && counter <= _31_DAYS) | ||
| { | ||
| // Variables | ||
| int mins_used; // Minutes used | ||
|
|
||
| // Ask how many (mins_used) | ||
| cout << "How many minutes used? "; | ||
| cin >> mins_used; | ||
| cout << endl; | ||
|
|
||
| // Validate (mins_used) | ||
| if (mins_used < 0) | ||
| { | ||
| // Explain input error (mins_used) | ||
| cout << "We're sorry. Minutes must be greater than 0.\n"; | ||
| cout << "Rerun the program and try again." << endl; | ||
| } | ||
| else | ||
| { | ||
| // Validate (mins_used) | ||
| if (counter == _31_DAYS && mins_used > NUM_MINS_IN_31_DAYS) | ||
| { | ||
| // Explain error (mins_used) to (NUM_MINS_IN_31_DAYS) | ||
| cout << "We're sorry. Minutes must be " << NUM_MINS_IN_31_DAYS; | ||
| cout << " or less.\nRerun the program and try again." << endl; | ||
| } | ||
| else if (counter == _30_DAYS && mins_used > NUM_MINS_IN_30_DAYS) | ||
| { | ||
| // Explain error (mins_used) to (NUM_MINS_IN_30_DAYS) | ||
| cout << "We're sorry. Minutes must be " << NUM_MINS_IN_30_DAYS; | ||
| cout << " or less.\nReturn the program and try again." << endl; | ||
| } | ||
| else if (counter == _28_DAYS && mins_used > NUM_MINS_IN_28_DAYS) | ||
| { | ||
| // Explain error (mins_used) to (NUM_MINS_IN_28_DAYS) | ||
| cout << "We're sorry. Minutes must be " << NUM_MINS_IN_28_DAYS; | ||
| cout << " or less.\nReturn the program and try again." << endl; | ||
| } | ||
| else | ||
| { | ||
| // Format precision | ||
| cout << setprecision(2) << fixed; | ||
|
|
||
| // Conditional Statement for each Package | ||
| total_charges_A = mins_used > A_MINS ? A_CHARGES + ((mins_used - A_MINS) * A_ADD) : A_CHARGES; | ||
| total_charges_B = mins_used > B_MINS ? B_CHARGES + ((mins_used - B_MINS) * B_ADD) : B_CHARGES; | ||
| total_charges_C = C_CHARGES; | ||
|
|
||
| // Calculates customer's monthly bill (choice A) | ||
| if (menu_choice == 'a' || menu_choice == 'A') | ||
| { | ||
| cout << "Package A monthly charges: $" << total_charges_A << endl; | ||
| cout << endl; | ||
|
|
||
| // Decides if Package A is greater than B | ||
| if (total_charges_A > total_charges_B) | ||
| { | ||
| cout << "You could have saved $" << total_charges_A - total_charges_B; | ||
| cout << " with Package B." << endl; | ||
| cout << "You could have saved $" << total_charges_A - total_charges_C; | ||
| cout << " with Package C." << endl; | ||
| } | ||
|
|
||
| } | ||
| // Calculates customer's monthly bill (choice B) | ||
| else if (menu_choice == 'b' || menu_choice == 'B') | ||
| { | ||
| cout << "Package B monthly charges: $" << total_charges_B << endl; | ||
|
|
||
| // Decides if Package B is greater than B | ||
| if (total_charges_B > total_charges_C) | ||
| { | ||
| cout << "You could have saved $" << total_charges_B - total_charges_C; | ||
| cout << " with Package C." << endl; | ||
| } | ||
|
|
||
| } | ||
| // Calculates customer's monthly bill (choice C) | ||
| else if (menu_choice == 'c' || menu_choice == 'C') | ||
| cout << "Package C monthly charges: $" << total_charges_C << endl; | ||
|
|
||
| } | ||
| } | ||
| } | ||
| break; | ||
|
|
||
| default: | ||
| // Display error (menu_choice). | ||
| cout << "We're sorry. Menu choice must be A, B, or C.\n"; | ||
| cout << "Rerun the program and try again." << endl; | ||
| } | ||
|
|
||
| cout << endl; | ||
|
|
||
| // Terminate program | ||
| return 0; | ||
| } |
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Chapter-5-Loops-and-Files/5.1-increment-and-decrement-operators/Checkpoint/5.1.cpp
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| /******************************************************************** | ||
| * | ||
| * 5.1 What will the following program segments display? | ||
| * | ||
| * Jesus Hilario Hernandez | ||
| * February 28, 2018 | ||
| * | ||
| ********************************************************************/ | ||
| #include <iostream> | ||
| using namespace std; | ||
| int main() | ||
| { | ||
| // What will the following program segments display? | ||
|
|
||
| // A) | ||
| int x = 2, | ||
| y = x++; | ||
|
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| cout << x << y << endl; // 32 | ||
|
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| // B) | ||
| int a = 2, | ||
| b = ++a; | ||
|
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| cout << a << b << endl; // 33 | ||
|
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| // C) | ||
| int c = 2, | ||
| d = 4; | ||
|
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| cout << c++ << --d << endl; // 23 | ||
|
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| // D) | ||
| int e = 2, | ||
| f = 2 * e++; | ||
|
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| cout << e << f << endl; // 34 | ||
|
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| // E) | ||
| int g = 99; | ||
|
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| if (g++ < 100) | ||
| cout << "It is true!\n"; // "It is true!" | ||
| else | ||
| cout << "It is false!\n"; | ||
|
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| // F) | ||
| int h = 0; | ||
|
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| if (++h) | ||
| cout << "It is true!\n"; // "It is true!" | ||
| else | ||
| cout << "It is false!\n"; | ||
|
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||
| // Terminate Program | ||
| return 0; | ||
| } |
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