C# Basics

What is the default value of a 'bool' in C#?

• false
• null
• undefined

Which of the following is a value type?

• object
• int
• dynamic

What is the size of 'double' in C#?

• 4 bytes
• 8 bytes
• 16 bytes

Which data type should be used for a single Unicode character?

• char
• bool
• var

What is the difference between 'float' and 'double'?

• float is less precise than double
• double is less precise than float
• float is more precise than double

What will be the result of: int a = 10; int b = 3; Console.WriteLine(a / b);

• 3
• 10
• 1

What is the result of the expression: true && false || true?

• false
• false || true
• true && false

What does the '??' operator do in C#?

• Returns left operand
• Returns right operand if left is null
• Throws exception if null

What is the output of: int x = 5; x += 2 * 3; Console.WriteLine(x);

• 11
• 7
• 5

What operator is used for string concatenation in C#?

• +
• &
• ++