Console.WriteLine and Write methods in C Sharp (C#) - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of mixed Write and WriteLine calls

What is the output of the following C# code?

C Sharp (C#)

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

A

!
dlroW olleH

B

Hello World!

C

Hello
 World
!

D

Hello World
!

💡 Hint

Remember that Write does not add a new line, but WriteLine does.

Console.Write writes text without moving to a new line. Console.WriteLine writes text and then moves to a new line. So the first Write prints "Hello" staying on the same line, then WriteLine prints " World" and moves to a new line, then the last WriteLine prints "!" and moves to a new line.

❓ Predict Output

intermediate

Output with multiple Write calls

What will be printed by this code snippet?

C Sharp (C#)

Console.Write("A");
Console.Write("B");
Console.WriteLine("C");
Console.WriteLine("D");

A

ABCD

B

ABC
D

C

A
B
C
D

D

AB
CD

💡 Hint

Write does not add a new line, WriteLine does.

The first two Write calls print 'A' and 'B' on the same line. Then WriteLine prints 'C' and moves to a new line. Finally, WriteLine prints 'D' and moves to a new line.

❓ Predict Output

advanced

Output of WriteLine with format string

What is the output of this code?

C Sharp (C#)

int x = 5;
int y = 10;
Console.WriteLine("Sum of {0} and {1} is {2}", x, y, x + y);

A

Sum of 5 and 10 is 15

B

Sum of {0} and {1} is {2}

C

Sum of 5 and 10 is {2}

D

Sum of x and y is 15

💡 Hint

Check how placeholders {0}, {1}, {2} are replaced by arguments.

The placeholders {0}, {1}, and {2} are replaced by the values of x, y, and x + y respectively. So the output is 'Sum of 5 and 10 is 15' followed by a new line.

❓ Predict Output

advanced

Effect of WriteLine with no arguments

What does this code print?

C Sharp (C#)

Console.Write("Line1");
Console.WriteLine();
Console.WriteLine("Line3");

A

Line1

Line3

B

Line1Line3

C

Line1
Line3

D

Line1
 Line3

💡 Hint

WriteLine with no arguments just moves to the next line.

Console.Write prints 'Line1' without a new line. Console.WriteLine() prints just a new line. Console.WriteLine("Line3") prints 'Line3' and moves to a new line. So the output has a blank line between Line1 and Line3.

❓ Predict Output

expert

Output of nested Write and WriteLine with escape sequences

What is the output of this code?

C Sharp (C#)

Console.Write("Start\n");
Console.WriteLine("Middle\tEnd");
Console.Write("Finish");

A

hsiniF
dnE	elddiM
tratS

B

Start

Middle	End
Finish

C

Start
Middle	End
Finish

D

hsiniF
dnE	elddiM

tratS

💡 Hint

Remember \n is newline and \t is tab. WriteLine adds a newline after printing.

Console.Write("Start\n") prints 'Start' and a newline but does not add an extra newline. Console.WriteLine("Middle\tEnd") prints 'Middle', a tab, 'End', then a newline. Console.Write("Finish") prints 'Finish' without newline. So the output lines are: Start Middle End Finish