string studentName = "Priya Shah";

Console.WriteLine($"Welcome, {studentName}.");

Welcome, Priya Shah.

Console.Write("Student name: ");
string studentName = Console.ReadLine();

Student name:

Console.Write("Student name: ");
string studentName = Console.ReadLine();

Console.Write("Student name: ");
string studentName = Console.ReadLine();

Console.WriteLine($"Welcome, {studentName}.");

Student name: Priya Shah [Enter]
Welcome, Priya Shah.

Console.WriteLine("Student name: ");
string studentName = Console.ReadLine();

Student name:
Priya Shah [Enter]

Student name: Priya Shah [Enter]
Student:  Priya Shah
Trip: Science Center [Enter]
Trip:     Science Center

Student name: Priya Shah [Enter]
Trip: Science Center [Enter]

=== FIELD TRIP SIGN-UP ===
Student:  Priya Shah
Trip:     Science Center

Console.Write("Grade level: ");
int gradeLevel = Console.ReadLine();

1-8-registration.cs(2,20): error CS0029: Cannot implicitly convert type 'string' to 'int'
The build failed. Fix the build errors and run again.

int level = "24";

1-5-card.cs(1,20): error CS0029: Cannot implicitly convert type 'string' to 'int'
The build failed. Fix the build errors and run again.

1-5-card.cs(1,20): error CS0029: Cannot implicitly convert type 'string' to 'int'
The build failed. Fix the build errors and run again.

1-8-registration.cs(2,20): error CS0029: Cannot implicitly convert type 'string' to 'int'
The build failed. Fix the build errors and run again.

'F' → Fullscreen

Build

Create a new C# program named 1-8-registration, starting empty.

Task 1: One Question

• Write the code below and run it.
• Answer the question when the cursor stops.
• Run it a second time with a different answer. The output changes without you editing anything, and that is the whole point of input.

1
Console.Write("Student name: ");
2
string studentName = Console.ReadLine();
3

4
Console.WriteLine($"Welcome, {studentName}.");

Task 2: A Registration Form

• Add two more questions, each with its own variable.
• Ask all three questions first, then print the summary. Do not alternate question, answer, question, answer.
• Line up the labels using spaces inside the strings.
• Note: the green lines marked with a + sign are new. Do not type the + sign.
• Task 1's welcome line goes away. The summary block replaces it, so delete that one line as you go — it is the only thing you remove today.

1
Console.Write("Student name: ");
2
string studentName = Console.ReadLine();
3

4
Console.Write("Trip: ");
5
string destination = Console.ReadLine();
6

7
Console.Write("Homeroom: ");
8
string homeroom = Console.ReadLine();
9

10
Console.WriteLine();
11
Console.WriteLine("=== FIELD TRIP SIGN-UP ===");
12
Console.WriteLine($"Student:  {studentName}");
13
Console.WriteLine($"Trip:     {destination}");
14
Console.WriteLine($"Homeroom: {homeroom}");

Task 3: Plan, Then Add Two More

• The three comments are a plan. Write the code for them.
• The two new questions have to be asked before the summary prints. Think about where they go, not just where the comments are.
• The last line should read as a sentence using all five answers, not as another list.

1
Console.Write("Student name: ");
2
string studentName = Console.ReadLine();
3

4
Console.Write("Trip: ");
5
string destination = Console.ReadLine();
6

7
Console.Write("Homeroom: ");
8
string homeroom = Console.ReadLine();
9

10
Console.WriteLine();
11
Console.WriteLine("=== FIELD TRIP SIGN-UP ===");
12
Console.WriteLine($"Student:  {studentName}");
13
Console.WriteLine($"Trip:     {destination}");
14
Console.WriteLine($"Homeroom: {homeroom}");
15

16
// Ask for a bus
17
// Ask for a shirt size
18
// Print a one-line sentence using all five answers

Task 4: Ask for a Number

• At the bottom, add the two lines below and run it.
• Copy the error message exactly, including the numbers in the parentheses.
• Then find where you have seen it before. It is in your Activity 1.5 work, with the same number.
• Leave it broken. Comment the two lines out so the rest of your program still runs, and hand it in that way.

1
Console.Write("Grade level: ");
2
int gradeLevel = Console.ReadLine();
3

4
Console.WriteLine($"Next year you'll be in grade {gradeLevel + 1}.");

Challenge (Optional): Guess the Fix

• Write a comment at the bottom of your program saying what you think would make Task 4 work.
• You are not expected to know. Guessing carefully is the exercise, and next session opens on these guesses.
• While you are there, change one prompt from Console.Write to Console.WriteLine and describe what moved.

Same Idea, Exam Notation

Console.Write("Name? ");
string name = Console.ReadLine();
Console.WriteLine($"Hello, {name}");

DISPLAY("Name? ")
name ← INPUT()
DISPLAY("Hello, ")
DISPLAY(name)

• INPUT() is the reference sheet's Console.ReadLine. It hands back what the user typed, and the arrow catches it.
• The sheet has no types, so it never has to say what kind of value comes back. That is why Task 4 has no equivalent there.
• DISPLAY takes one value at a time and adds a space after it, so the sheet needs two lines where interpolation needs one.

Checkpoint

Your finished program should run like this.

Student name: Priya Shah [Enter]
Trip: Science Center [Enter]
Homeroom: Room 214 [Enter]
Bus: Bus 4 [Enter]
Shirt size: M [Enter]

=== FIELD TRIP SIGN-UP ===
Student:  Priya Shah
Trip:     Science Center
Homeroom: Room 214
Bus:      Bus 4
Shirt:    M

Priya Shah of Room 214 is going to Science Center on Bus 4 in a size M shirt.

• All five questions are asked before anything is summarized.
• Every answer is stored in a variable named for what it holds.
• The summary sentence uses all five, and reads as a sentence.
• Task 4's error is written down, and its two lines are commented out.

Reflection

Answer the following questions before submitting your work.

1. Your program produces different output every time it runs, without you editing it. Explain what changed and what did not.
2. Task 4 gave you the same error number as a mistake you made in Activity 1.5, where no user typed anything. What do those two situations have in common?
3. What do you think Console.ReadLine hands back if the user presses Enter without typing anything? Give a reason for your answer.

Submit

Submit four things to the dropbox:

1. Your 1-8-registration program file.
2. A copy of one full run, questions and answers included.
3. Task 4's error message, copied exactly.
4. Your three reflection answers.

Activity Complete