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

Find the output of C#.Net programs | Namespace | Set 1: Enhance the knowledge of C#.Net Namespace concepts by solving and finding the output of some C#.Net programs.
Submitted by Nidhi, on February 10, 2021

Question 1:

using System;

namespace MyNameSpace
{
    class A
    {
        public static int Num1;
        public static int Num2;
    }
}
    
class Program
{
    //Entry point of the program
    static void Main(string[] args)
    {
        int C = 0;

        MyNameSpace.A.Num1 = 10;
        MyNameSpace.A.Num2 = 20;

        C = MyNameSpace.A.Num1 + MyNameSpace.A.Num2;

        Console.WriteLine("C : {0}", C);
    }
}

Output:

C : 30
Press any key to continue . . .

Explanation:

In the above program, we created a namespace MyNameSpace that contains a class A, and class A contains two public integer variables Num1 and Num2.

Now look to the Program class that contains the Main() method. Here, we created a local variable C and initialized Num1 and Num2 with 10 and 20 respectively. Then add values of Num1 and Num2 and assigned to variable C and then print the value of C on the screen.

Question 2:

using System;

namespace MyNameSpace
{
    class A
    {
        public static int Num1;
        public static int Num2;
    }
}
    
class Program
{
    //Entry point of the program
    static void Main(string[] args)
    {
        int C = 0;

        MyNameSpace::A.Num1 = 10;
        MyNameSpace::A.Num2 = 20;

        C = MyNameSpace::A.Num1 + MyNameSpace::A.Num2;

        Console.WriteLine("C : {0}", C);
    }
}

Output:

main.cs(19,9): error CS0432: Alias `MyNameSpace' not found
main.cs(20,9): error CS0432: Alias `MyNameSpace' not found
main.cs(22,13): error CS0432: Alias `MyNameSpace' not found

Explanation:

The above program will generate syntax errors because, in the above program, we used "::" operator to access members of the namespace, which is not correct, we need to use dot '.' operator to access members of the namespace in C#.

Question 3:

using System;

namespace MyNameSpace
{
    class A
    {
        public static int Num;
    }

    namespace Nested
    {
        class A
        {
            public static int Num;
        }
    }
}
    
class Program
{
    //Entry point of the program
    static void Main(string[] args)
    {
        int C = 0;

        MyNameSpace.A.Num        = 10;
        MyNameSpace.Nested.A.Num = 20;

        C = MyNameSpace.A.Num + MyNameSpace.Nested.A.Num;

        Console.WriteLine("C : {0}", C);
    }
}

Output:

C : 30
Press any key to continue . . .

Explanation:

In the above program, we created a namespace MyNameSpace that contains a class A, and a namespace nested. class A contains a public integer variable Num in both namespaces MyNameSpace and Nested.

Now look to the Program class that contains the Main() method. Here, we created a local variable C.

MyNameSpace.A.Num        = 10;
MyNameSpace.Nested.A.Num = 20;

Here, we initialized values of class members that contained in the namespaces,

C = MyNameSpace.A.Num + MyNameSpace.Nested.A.Num;

Add values of data members and assigned to local variable C, and printed the value of C on the console screen.

Question 4:

using System;

namespace MyNameSpace
{
    class A
    {
        public static int Num1;
        public static int Num2;
    }

    public void Fun()
    {
        Console.WriteLine("Hello Word");
    }
}

class Program
{
    //Entry point of the program
    static void Main(string[] args)
    {
        int C = 0;

        MyNameSpace.A.Num1 = 10;
        MyNameSpace.A.Num2 = 20;

        C = MyNameSpace.A.Num1 + MyNameSpace.A.Num2;

        MyNameSpace.Fun();
        Console.WriteLine("C : {0}", C);
    }
}

Output:

main.cs(11,11): error CS1525: Unexpected symbol `void', expecting `class', `delegate', `enum', `interface', `partial', or `struct'
main.cs(13,8): error CS1525: Unexpected symbol `Console', expecting `class', `delegate', `enum', `interface', `partial', or `struct'
main.cs(13,25): error CS1525: Unexpected symbol `(', expecting `class', `delegate', `enum', `interface', `partial', or `struct'
main.cs(14,5): error CS1514: Unexpected symbol `}', expecting `.' or `{'

Explanation:

The above program will generate a compile-time error because we cannot contain a method in the namespace directly, here namespace MyNameSpace contains Fun() method, which is not correct.

Question 5:

using System;

namespace MyNameSpace
{
    class A
    {
        public static int Num;
    }

    struct Str
    {
        static int Num;
    }
}

class Program
{
    //Entry point of the program
    static void Main(string[] args)
    {
        int C = 0;

        MyNameSpace.A.Num   = 10;
        MyNameSpace.Str.Num = 20;

        C = MyNameSpace.A.Num + MyNameSpace.Str.Num;

        Console.WriteLine("C : {0}", C);
    }
}

Output:

main.cs(24,25): error CS0122: `MyNameSpace.Str.Num' is inaccessible due to its protection level
main.cs(26,49): error CS0122: `MyNameSpace.Str.Num' is inaccessible due to its protection level

Explanation:

The above program will generate syntax errors because the structure STR contains private member Num that cannot be accessed outside the structure directly.



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