C# Operator MCQs

Question 1: What will be the output of the following program?

public static void Main(string[] args)
{
    int a = 1, b = 2, c = 3;
    
    Console.Write(a+b*c);
    Console.Write (a+(b*c));
    Console.Write ((a*b)+(b*c));   
    Console.Write ((a*b)+(b*c)-c);   
}

• 7, 7, 8, 5
• 9,9,8, 5
• 9,9,7,5
• 7,7,9,6

Check Answer

a+b*c = a + (b*c) = 1 + (2*3) = 7
(a*b)+(b*C) = (1*2)+(2*3)=2+6=8
(a*b)+(b*c)-c=(1*2)+(2*3)-3=(1*2)+3=5

Question 2: What will be the output of the following program?

public static void Main(string[] args)
 {
    int x = 2, y = 6, z;
    z=  x * ( y + x) / (y - x) + 10;
    Console.Write(z);
}

• 14
• 24
• 1
• 34

Check Answer

Z=x*(y+x)/(y-x)+10
= 2*(2+6)/(6-2) + 10
=2*(8/4)+10
=2*2+10
=4+10
14

Question 3: What will be the output of the following program?

public static void Main(string[] args)
{
    int a = 2;
	   
 	Console.Write( ++a);  
	Console.Write(a++);
	Console.Write( a);  
}

• 334
• 445
• 244
• 345

Check Answer

Question 4: What will be the output of the following program?

class Program
{
    static void Main()
    {
        Person p = null;
        var name = p?.FirstName ?? "Unknown" + p?.LastName ;

        Console.Write(name);
    }
}

class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

• Compile-time error
• Runtime error
• Blank output
• Unknown

Check Answer

Question 5: What will be the output of the following code?

IList numbers = null;
Console.Write(numbers?[0]);

• Compile-time error
• Runtime error
• Blank output
• System.Int32

Check Answer