C# Quizz - LC Year 9

What is the difference between Console.Write and Console.WriteLine?

• Console.WriteLine moves to the next line.
• Console.Write moves to the next line.
• Both move to the next line.
• Console.WriteLine keeps on the same line.
• None

Answer explanation

Console.WriteLine writes and moves to the next line, while Console.Write keeps writing on the same line.

What is the correct format to name a variable in camel case?

• MyVariable
• myVariable
• My_variable
• my_variable
• None

Answer explanation

Camel case starts with a lowercase letter, and each new word starts with an uppercase letter.

Which of the following is true when using var to initialize variables?

• var requires a specific type like int, string.
• var is used when the type is unknown.
• var cannot store strings.
• var can store multiple types of values.
• None

Answer explanation

var automatically infers the type of the value it is assigned, such as int, string, or double.

What will be the output of the following code? Console.WriteLine("Hello\tWorld\n!");

• Hello World

  !

• Hello World
• Hello World !
• Hello World
• None

Answer explanation

The \t adds a tab space and \n moves to the next line.

Which of the following methods allows you to concatenate strings in Console.WriteLine?

• + (plus sign)
• $ (dollar sign)
• & (ampersand)
• @ (verbatim symbol)
• None

Answer explanation

Concatenation uses + to combine multiple strings. Interpolation uses $.

What will be the output of this code: Console.WriteLine(3 + 2 * 5);

• 13
• 25
• 10
• 15
• None

Answer explanation

The multiplication happens before the addition, following the order of operations (PEMDAS).

How do you check if a number is positive or negative using if/else in C#?

• if(number > 0)
• if(number < 0)
• if(number = 0)
• if(number >= 0)
• None

Answer explanation

The if condition checks if the number is greater than 0 to determine if it's positive.

What will happen if this condition is false? if (x > 10)

• The code in the if block is executed.
• The code in the else block is executed.
• The program stops.
• The program crashes.
• None

Answer explanation

If the condition is false, the code inside the else block is executed.

What does the following code do? int[] grades = {90, 85, 78, 88}; for(int i = 0; i < grades.Length; i++) { Console.WriteLine(grades[i]); }

• Prints all grades stored in the array.
• Prints only the first grade.
• Crashes the program.
• Prints the last grade only.
• None

Answer explanation

The for loop prints each value in the grades array one by one.

What is the output of this code: int[] numbers = {1, 2, 3}; Console.WriteLine(numbers.Length);

• 1
• 2
• 3
• None

Answer explanation

The .Length property returns the number of elements in the array, which is 3.