Console.WriteLine and Write methods in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print a line with a new line at the end.

C Sharp (C#)

Console.[1]("Hello, world!");

Drag options to blanks, or click blank then click option'

AWrite

BPrintLine

CPrint

DWriteLine

Attempts:

3 left

💡 Hint

Common Mistakes

Using Write instead of WriteLine when a new line is needed.

The WriteLine method prints the text and moves to the next line.

2fill in blank

medium

Complete the code to print text without moving to a new line.

C Sharp (C#)

Console.[1]("Hello, ");
Console.WriteLine("world!");

Drag options to blanks, or click blank then click option'

AWriteLine

BPrint

CWrite

DPrintLine

Attempts:

3 left

💡 Hint

Common Mistakes

Using WriteLine when you want to continue printing on the same line.

The Write method prints text but stays on the same line.

3fill in blank

hard

Fix the error in the code to print two lines correctly.

C Sharp (C#)

Console.[1]("First line");
Console.[1]("Second line");

Drag options to blanks, or click blank then click option'

APrintLine

BWriteLine

CPrint

DWrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using Write which does not add a new line, causing lines to run together.

To print two separate lines, use WriteLine for both so each ends with a new line.

4fill in blank

hard

Fill both blanks to print numbers 1 to 3 on the same line separated by spaces.

C Sharp (C#)

for (int i = 1; i <= 3; i++)
{
    Console.[1](i + " ");
}
Console.[2]();

Drag options to blanks, or click blank then click option'

AWrite

BWriteLine

CWriteLine()

DWrite()

Attempts:

3 left

💡 Hint

Common Mistakes

Using WriteLine inside the loop causing each number to print on a new line.

Use Write inside the loop to print numbers on the same line, then WriteLine to move to the next line after the loop.

5fill in blank

hard

Fill all three blanks to print a greeting with a name on the same line.

C Sharp (C#)

string name = "Alice";
Console.[1]("Hello, ");
Console.[2](name);
Console.[3]("!");

Drag options to blanks, or click blank then click option'

AWriteLine

BWrite

CWriteLine()

DWrite()

Attempts:

3 left

💡 Hint

Common Mistakes

Using WriteLine which moves to a new line after each print.

Use Write for all parts to print on the same line without moving to a new line.

Practice

1. What is the main difference between Console.WriteLine and Console.Write in C#?

easy

A. Console.WriteLine only prints numbers; Console.Write only prints strings.

B. Console.WriteLine prints text without a newline; Console.Write prints text and moves to a new line.

C. Console.WriteLine prints text and moves to a new line; Console.Write prints text but stays on the same line.

D. Console.WriteLine clears the console; Console.Write appends text.

Solution

1. Step 1: Understand Console.WriteLine behavior

   Console.WriteLine prints the given text and then moves the cursor to the next line.

2. Step 2: Understand Console.Write behavior

   Console.Write prints the given text but keeps the cursor on the same line, so the next output continues on that line.

3. Final Answer:

   Console.WriteLine prints text and moves to a new line; Console.Write prints text but stays on the same line. -> Option C

4. Quick Check:

   WriteLine adds newline, Write does not [OK]

Hint: WriteLine adds newline; Write stays on same line [OK]

Common Mistakes:

• Confusing which method adds a newline
• Thinking WriteLine does not move to next line
• Assuming Write clears the console

2. Which of the following is the correct syntax to print "Hello World" on the console and move to the next line?

easy

A. Console.Write("Hello World");

B. Console.WriteLine["Hello World"];

C. Console.WriteLine Hello World;

D. Console.WriteLine("Hello World");

Solution

1. Step 1: Check method usage with parentheses and quotes

   In C#, method calls require parentheses and string arguments must be in double quotes.

2. Step 2: Identify correct method for printing with newline

   Console.WriteLine("Hello World"); correctly prints the text and moves to the next line.

3. Final Answer:

   Console.WriteLine("Hello World"); -> Option D

4. Quick Check:

   Correct syntax uses parentheses and quotes [OK]

Hint: Use WriteLine with parentheses and quotes for new line [OK]

Common Mistakes:

• Missing parentheses after method name
• Using square brackets instead of parentheses
• Omitting quotes around string

3. What will be the output of the following C# code?

Console.Write("Hello ");
Console.WriteLine("World!");
Console.WriteLine("Goodbye!");

medium

A. Hello
World!
Goodbye!

B. Hello World!
Goodbye!

C. Hello World!Goodbye!

D. Hello
World!
Goodbye!

Solution

1. Step 1: Analyze first line with Console.Write

   Console.Write("Hello "); prints "Hello " and stays on the same line.

2. Step 2: Analyze second line with Console.WriteLine

   Console.WriteLine("World!"); prints "World!" on the same line and then moves to the next line.

3. Step 3: Analyze third line with Console.WriteLine

   Console.WriteLine("Goodbye!"); prints "Goodbye!" on a new line and moves to next line.

4. Final Answer:

   Hello World! Goodbye! -> Option B

5. Quick Check:

   Write stays, WriteLine adds newline [OK]

Hint: Write stays on line, WriteLine adds newline after output [OK]

Common Mistakes:

• Assuming WriteLine does not add newline
• Thinking Write moves to next line
• Confusing output line breaks

4. The following code is intended to print "12345" on the same line, but it prints each number on a new line instead. What is the error?

for (int i = 1; i <= 5; i++)
{
    Console.WriteLine(i);
}

medium

A. Use Console.Write instead of Console.WriteLine inside the loop.

B. Change the loop to start from 0 instead of 1.

C. Add a semicolon after the for loop declaration.

D. Use Console.ReadLine instead of Console.WriteLine.

Solution

1. Step 1: Understand the difference between Write and WriteLine in loop

   Console.WriteLine(i); prints the number and moves to a new line each time.

2. Step 2: Fix by using Console.Write to stay on the same line

   Replacing with Console.Write(i); prints numbers continuously on the same line.

3. Final Answer:

   Use Console.Write instead of Console.WriteLine inside the loop. -> Option A

4. Quick Check:

   Write stays on line, WriteLine adds newline [OK]

Hint: Use Write to print on same line inside loops [OK]

Common Mistakes:

• Using WriteLine when same line output is needed
• Adding unnecessary semicolons after for loop
• Confusing ReadLine with WriteLine

5. You want to print the numbers 1 to 3 on the same line separated by spaces, then print "Done" on the next line. Which code snippet achieves this correctly?

hard

A. for (int i = 1; i <= 3; i++) { Console.Write(i + " "); } Console.WriteLine("Done");

B. for (int i = 1; i <= 3; i++) { Console.WriteLine(i + " "); } Console.WriteLine("Done");

C. for (int i = 1; i <= 3; i++) { Console.Write(i); } Console.WriteLine("Done");

D. for (int i = 1; i <= 3; i++) { Console.WriteLine(i); } Console.Write("Done");

Solution

1. Step 1: Print numbers 1 to 3 on the same line with spaces

   Using Console.Write(i + " "); prints each number followed by a space without moving to a new line.

2. Step 2: Print "Done" on the next line

   Console.WriteLine("Done"); prints "Done" and moves to the next line.

3. Final Answer:

   for (int i = 1; i <= 3; i++) { Console.Write(i + " "); } Console.WriteLine("Done"); -> Option A

4. Quick Check:

   Write with space, then WriteLine for new line [OK]

Hint: Use Write with space, then WriteLine for next line [OK]

Common Mistakes:

• Using WriteLine inside loop causing multiple lines
• Not adding spaces between numbers
• Printing "Done" without newline