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C#.Net find output programs (switch statement) | set 1

Find the output of C#.Net programs | switch statement | Set 1: Enhance the knowledge of C#.Net switch statement concepts by solving and finding the output of some C#.Net programs.
Submitted by Nidhi, on February 06, 2021

Question 1:

using System;

namespace Demo
{
    class Program
    {
        //Entry point of the program
        static void Main(string[] args)
        {
            bool value;

            value = (null == 0);

            switch (value)
            { 
                case true:
                    Console.WriteLine("www.includehelp.com");
                    break;
                case false:
                    Console.WriteLine("www.google.com");
                    break;
            }
        }
    }
}

Output:

www.google.com
Press any key to continue . . .

Explanation:

In the above program, we created a variable value, which is assigned by the below expression,

value = (null == 0);

Here we compare null wit 0 then it will return false and assigned to variable value. that's why case false will execute and print "www.google.com" on the console screen.

Question 2:

using System;

namespace Demo
{
    class Program
    {
        //Entry point of the program
        static void Main(string[] args)
        {
            bool value;

            value = ((int)(Math.PI) == 3); 

            switch (value)
            { 
                case true:
                    Console.WriteLine("www.includehelp.com");
            
                case false:
                    Console.WriteLine("www.google.com");
            
            }
        }
    }
}

Output:

main.cs(16,17): error CS0163: Control cannot fall through from one case 
label `case true:' to another
main.cs(19,17): warning CS0162: Unreachable code detected
main.cs(19,17): error CS8070: Control cannot fall out of 
switch statement through final case label `case false:'

Explanation:

The above code will generate syntax errors because we cannot define case without a break statement in the switch block.

Question 3:

using System;

namespace Demo
{
    class Program
    {
        //Entry point of the program
        static void Main(string[] args)
        {
            bool value;

            value = ((int)(Math.PI) == 3); 

            switch (value)
            { 
                default:
                    Console.WriteLine("###############");
                    break;
                case true:
                    Console.WriteLine("@@@@@@@@@@@@@@@");
                    break;
                case false:
                    Console.WriteLine("$$$$$$$$$$$$$$$");
                    break;
            }
        }
    }
}

Output:

@@@@@@@@@@@@@@@
Press any key to continue . . .

Explanation:

In the above program, we created a boolean variable value, which is initialized with below expression,

value = ((int)(Math.PI) == 3); 
value = ((int)(3.14159265358979) == 3); 
value = (3 == 3); 
value = true;

Then the case true will execute and print "@@@@@@@@@@@@@@@" on the console screen.

Question 4:

using System;

namespace Demo
{
    class Program
    {
        //Entry point of the program
        static void Main(string[] args)
        {
            int num = 10;

            switch (num)
            { 
                default:
                    Console.WriteLine("###############");
                    break;
                case 1 to 5:
                    Console.WriteLine("@@@@@@@@@@@@@@@");
                    break;
                case 6 to 10:
                    Console.WriteLine("$$$$$$$$$$$$$$$");
                    break;
                case 11 to 15:
                    Console.WriteLine("$$$$$$$$$$$$$$$");
                    break;
            }
        }
    }
}

Output:

main.cs(17,23): error CS1525: Unexpected symbol `to'
main.cs(20,23): error CS1525: Unexpected symbol `to'
main.cs(23,24): error CS1525: Unexpected symbol `to'

Explanation:

The above program will generate syntax error because we cannot use to in the case of the switch block.

Question 5:

using System;

namespace Demo
{
    class Program
    {
        //Entry point of the program
        static void Main(string[] args)
        {
            int num = 10;

            switch (num)
            { 
                case (11-5):
                    Console.WriteLine("@@@@@@@@@@@@@@@");
                    break;
                case (21-10):
                    Console.WriteLine("$$$$$$$$$$$$$$$");
                    break;
                case (31-15):
                    Console.WriteLine("$$$$$$$$$$$$$$$");
                    break;
                default:
                    Console.WriteLine("###############");
                    break;
            }
        }
    }
}

Output:

###############
Press any key to continue . . .

Explanation:

In the above program, we created a variable num, which is initialized with 10. After evaluating case statements, code will be like this:

switch (num)
{ 
    case 6:
        Console.WriteLine("@@@@@@@@@@@@@@@");
        break;
    case 11:
        Console.WriteLine("$$$$$$$$$$$$$$$");
        break;
    case 16:
        Console.WriteLine("$$$$$$$$$$$$$$$");
        break;
    default:
        Console.WriteLine("###############");
        break;
}

The value of num is 10, then default case will execute and print "###############" on the console screen.

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