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Home » Aptitude Questions and Answers » C# Aptitude Questions and Answers

C# Structures Aptitude Questions and Answers | Set 4

C# Structures Aptitude Questions | Set 4: This section contains aptitude questions and answers on C# Structures.
Submitted by Nidhi, on April 10, 2020

1) What is the output of given code snippets?

using System;

struct sample
{
    int a;
    int b;

    public sample()
    {
        a = 10;
        b = 20;
    }

    public void disp()
    {
        Console.WriteLine(a + " " + b);
    }
}

class Employee
{
    static void Main(string[] args)
    {
    
        sample S = new sample();

        S.disp();
    }
}

Answer & Explanation

Correct answer: 3
Syntax Error

In C#.Net, we cannot use an explicit parameterless constructor in C#.Net.

The output would be,

    Structs cannot contain explicit parameterless constructors

2) What is the output of given code snippets?

using System;

struct sample
{
    public int a;
    public int b;
}

class Employee
{
    static void Main(string[] args)
    {
        sample S = new sample();

        S.a = 10;
        S.b = 20;

        Console.WriteLine(S.a + " " + S.b);
    }
}

Answer & Explanation

3) What is the output of given code snippets?

using System;

struct sample
{
    public int a;
    public int b;
}

class Employee
{
    static void Main(string[] args)
    {
        const sample S;

        S.a = 10;
        S.b = 20;

        Console.WriteLine(S.a + " " + S.b);
    }
}

Answer & Explanation

Correct answer: 3
Syntax Error

In C#.Net, the above code will generate a syntax error, we cannot create a const keyword like this.

The output would be,

    A const field requires a value to be provided

4) What is the output of given code snippets?

using System;

struct sample
{
    public int a;
    public int b;
}

class Employee
{
    static void Main(string[] args)
    {
        sample []S;

        S = new sample[2];

        S[0].a = 10;
        S[0].b = 20;
        
        S[1].a = 30;
        S[1].b = 40;

        Console.WriteLine(S[0].a + " " + S[0].b + " " + S[1].a+ " " + S[1].b);
    }
}

Answer & Explanation

5) What is the output of given code snippets?

using System;

struct sample
{
    int a;
    int b;

    public sample(int X, int Y)
    {
        a = X;
        b = Y;
    }

    public void disp()
    {
        Console.WriteLine(a + " " + b);
    }
}

class Employee
{
    static void Main(string[] args)
    {

        sample []S = new sample[2]{{10, 20},{30,40}};

        S[0].disp();
    }
}

Answer & Explanation

Correct answer: 3
Syntax Error

In C#.Net, the above code will generate syntax error, this is not a proper way to call constructors in case of an array of structure.

The output would be,

    Array initializers can only be used in a variable or field initializer. Try using a new expression instead

C# Structures Aptitude Questions and Answers | Set 4

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