C and C++ programming

Try this

1. Write a program that reads the user's full name with std::getline and then their age with std::cin, and prints a greeting with their age next year; then change it to read the name with std::cin, type a two-word name, and note what goes wrong.
2. Write a function void addBonus(int& salary, int bonus) and a second version that takes salary by value instead; call both on a salary of 25000 with a bonus of 3000 and print the salary after each call to see which one changes it.
3. Write a function void printBill(const std::string& item, int qty, double rate) that prints one bill line, call it for three items from a stationery shop, then add a line inside it that tries to change item and note the error the compiler reports.

Try this

1. Type the BankAccount class from this lesson, add a member function that prints a mini statement with the holder's name and balance, create accounts for two friends, and make several deposits and withdrawals on each to show that their balances stay separate.
2. Write a Rectangle class with private length and width, a set function that ignores negative values, and const member functions area() and perimeter() that are defined outside the class with the scope resolution operator ::; check that length 4 and width 2.5 give an area of 10 and a perimeter of 13.
3. In main, try to change the private balance of a BankAccount object directly and copy the compiler error into your notebook; then change the keyword class to struct and delete the private: label, and confirm that the same line now compiles because struct members are public by default.

Try this

1. Type the Student class from this lesson and run it, then add Student d; as the last line before return in main and write down the complete output you expect, including the order of the Destroyed lines, before running it again to check.
2. Write a Product class whose only constructor takes a name and a price and sets them in a member initialiser list, try to create an object with Product p; and note the compiler error, then fix it by adding a default constructor.
3. Write a class Guard whose constructor prints Entering and whose destructor prints Leaving, create a Guard object at the top of a function that has two return statements, and call the function so that each return is taken once to confirm that Leaving is printed both times, which is the idea behind RAII.

Try this

1. Type the Employee and Manager classes from this lesson, add a destructor to each class that prints a message, and confirm from the output that the constructors run base first while the destructors run derived first.
2. Create a base class Vehicle with protected members brand and wheels, and two derived classes Car and Bike that each add one member of their own and a show function; create one object of each in main, then try to print brand directly from main and note the error.
3. Build a multilevel chain in which Student inherits publicly from Person and Topper inherits publicly from Student, give each class one data member and a constructor that passes values to its base through the initialiser list, and print every detail from a single Topper object.

Try this

1. Type the Shape and Circle program from this lesson and run it, then add virtual before void draw() in Shape and run it again; write down both outputs and explain in one sentence why the second one changed.
2. Add a third class, CashPayment, to the Payment example that overrides pay, and call checkout with it without changing the checkout function at all; then misspell pay in your new class and note the error that override makes the compiler report.
3. Write an abstract class Shape with a pure virtual function area() and a virtual destructor, derive Circle and Rectangle from it using override, store the addresses of one of each in an array of two Shape pointers and print every area in a loop; then try to create a Shape object directly and note the compiler error.

Try this

1. Write three overloaded functions named area for a square, a rectangle and a circle, call each one from main, and then add a fourth version that differs from one of them only in its return type to see the compiler reject it.
2. Type the Money class from this lesson, add an operator- that subtracts one amount from another, and print Rs 350.25 minus Rs 99.75 to check that the answer is Rs 250.50.
3. Write a function template largest that returns the larger of two values and test it with two ints, two doubles and two std::string objects; then write a class template Pair that stores two values of the same type with a member function that returns their sum, and test it with int and double.

Try this

1. Write a program that reads marks until the user enters -1, stores them in a std::vector of int with push_back, and prints how many marks were entered, their total, their average and the highest mark using a range-based for loop; if the user types -1 straight away, check empty() and print No marks entered instead of dividing by zero.
2. Keep the stock of five stationery items in a std::map from item name to quantity, let the user type an item name and print its quantity, and use find or count so that a name not in the map prints Not in stock instead of being added to the map.
3. Write a divide function that throws std::invalid_argument when the divisor is 0, call it inside a try block with two numbers typed by the user, catch it with a catch block for const std::exception& and print e.what(); then, inside the same try block, add a call to at(10) on a three-element vector and a separate catch block for std::out_of_range placed before the general std::exception one.