You can download the exams for Section A and for Section B. Note that they were different, but of equivalent difficulty.

Problem 1

Section A

// The next 4 lines were not needed in your answer.
char iniLName;
decimal pricePaid;
iniLName = 'K'; // Dummy value, change it to test.
pricePaid = 420M; // Dummy value, change it to test.

if(pricePaid > 600M){Console.WriteLine("You are in first class");}
else if (iniLName < 'H'){Console.WriteLine("You are in second class, left-side aisle.");}
else {Console.WriteLine("You are in second class, right-side aisle.");}

You may (rightfully) think “Hey, but I didn’t know characters have an order”, and would be right. But you could also work out a solution using switch or if, like:

if(pricePaid > 600M){Console.WriteLine("You are in first class");}
else if (iniLName == 'A' || iniLName == 'B' || 
         iniLName == 'C' || iniLName == 'D' || 
         iniLName == 'E' || iniLName == 'F' || 
         iniLName == 'G' || iniLName == 'H'){
    Console.WriteLine("You are in second class, left-side aisle.");
}
else {Console.WriteLine("You are in second class, right-side aisle.");}

Section B

Using format specifiers and getting the conditions right were more important that getting the loop correct for that exercise.

int age;
do{
    Console.WriteLine("Please, enter your age.");
}while(! int.TryParse(Console.ReadLine(), out age) || age < 0);

if (age > 5 && age < 19){Console.WriteLine($"It's {5:C}.");}
else if (age > 18 && age < 64){Console.WriteLine($"It's {12:C}.");}
else{Console.WriteLine("It's free for you.");}

Problem 2

You can use the code below to test your answers:

// The three values below are dummy.
// Change them to test your answers.
string citizenship = "US";
decimal income = 200M;
int age = 20;
     
switch (citizenship) {
    case("US"):
    case ("CA"):
        if (income > 100)
        if (age < 21) Console.WriteLine("Go to office A.");
        else if (age < 60) Console.WriteLine("Go to office B.");
        else Console.WriteLine("Go to office C.");
        else
            Console.WriteLine("Go to office D.");
    break;
    case ("DE"):
        if (income > 200 && age > 18) Console.WriteLine("Go to office E.");
        else Console.WriteLine("Go to office F.");
    break;
    case ("FR"):
        if (age <= 18 || income <= 10) Console.WriteLine("Go to office G.");
        else if (income > 200) Console.WriteLine("Go to office H.");
    break;
    default:
        if (age > 21) Console.WriteLine("Go to office I.");
        else Console.WriteLine("Go to office J.");
    break;
}

Problem 3

The two solutions are fairly similar. Short code was priviledged below, also because they show an original use of do while loops: the multiplication actually takes place before asking for a value, so that the multiplication will be performed only if the user actually gave a value to multiply. Of course, for the first run of the loop, we multiply by the “dummy” value 1.

Section A

int product = 1;
int answer = 1;
do{
    product *= answer;
    Console.WriteLine("Enter a number, or 0 (zero) to quit.");
    answer = int.Parse(Console.ReadLine());
}while(answer != 0);
Console.WriteLine("The product of the numbers you entered is " + product + ".");

Section B

int product = 1;
int answer = 1;
bool isNumber;
do{
    product *= answer;
    Console.WriteLine("Enter a number, or anything else to quit.");
    isNumber = int.TryParse(Console.ReadLine(), out answer);
}while(isNumber);
Console.WriteLine("The product of the numbers you entered is " + product + ".");

Problem 4

For both sections, refer to the solution given in lab 12. The version given to Section B was actually a simplification of that exercise.

Problem 5

The questions were identical for both sections:

A constructor does not have a return type.
The signature of a method is its name and the ordered list of its input type. So, the signature of the given method is Scale, int.
Method overloading is when two methods have the same name (but different signatures, of course).
public Square(){} is a constructor for that class that takes no argument.
The ToString() method is implicitely called when we try to display an object using Console.WriteLine.
The UML diagram would like like this:

Square
- dimension : int
+ GetDimension() : int
+ SetDimension(dimensionP : int) : void