C# Variable MCQs

Question 6: What will be the output of the following program?

public class Program
{
	public static void Main()
	{
		Employee emp = new Employee();
		Console.WriteLine(emp.salary); 
	}
}

public class Employee
{
	public int salary;
}

Answer: B

Static variables, instance variables, and array elements are automatically initialized to their default values. The default value of int is 0, so emp.salary is 0. Learn C# variables.

Question 7: What will be the output of the following program?

public class Program
{
	public static void Main()
	{
		int[] arr = new int[5];
		Console.WriteLine(arr[0]); 
	}
}

Answer: B

Static variables, Instance variables of class instances, and array elements are automatically initialized to their default values. The default value of int is 0, so all the elements in an integer array would be 0 by default. Learn C# variables.

Question 8: What will be the output of the following program? 

public static void Main()
{
	int k;
	display(k);
}
	
static void display(int val)
{
	Console.Write(val);
}

Answer: C

The variable must be initialized before accessing it or passing it to a function, otherwise the compiler would give an error. Learn C# variables.

Question 9: Which of the following keyword is used to declare a variable whose type will be automatically determined by the compiler?

Answer: B

Variables declared using var is called Implicitly Typed Variable. The C# compiler will determine its type at compile-time based on the value assigned to it.

Question 10: Which of the following type escapes type checking at compile-time; instead, it resolves type at run time?

Answer: A

The C# compiler does not check for the type of a dynamic variable. The type of a dynamic variable will be determined at the runtime based on the value it holds at runtime. It can hold any type of value at run time and not tied up to the specific data type.