Instance fields and state in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an instance field named 'count' of type int.

C Sharp (C#)

public class Counter {
    private [1] count;
}

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Aint

Bstatic

Cstring

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'void' as a type for a field.

Using 'static' keyword instead of a type.

Using 'string' when the field should hold numbers.

The instance field 'count' should be declared with the type int to store integer values.

2fill in blank

medium

Complete the code to initialize the instance field 'count' to zero in the constructor.

C Sharp (C#)

public class Counter {
    private int count;
    public Counter() {
        [1] = 0;
    }
}

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Athis

BCounter

Cvoid

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using the class name 'Counter' instead of the field name.

Using 'this' alone without the field name.

Using 'void' which is not a variable.

The instance field 'count' is assigned the value 0 inside the constructor by using its name directly.

3fill in blank

hard

Fix the error in the method to correctly increment the instance field 'count'.

C Sharp (C#)

public class Counter {
    private int count;
    public void Increment() {
        [1]++;
    }
}

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AIncrement

BCounter

Ccount

Dthis

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to increment the class name 'Counter'.

Using the method name 'Increment' as a variable.

Using 'this' alone without the field name.

The method should increment the instance field 'count' by using its name directly.

4fill in blank

hard

Fill both blanks to create a method that returns the current value of the instance field 'count'.

C Sharp (C#)

public class Counter {
    private int count;
    public [1] GetCount() {
        return [2];
    }
}

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Aint

Bvoid

Ccount

DCounter

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'void' as return type when the method returns a value.

Returning the class name instead of the field.

Returning nothing or wrong variable.

The method should return an integer, so its return type is int, and it returns the instance field count.

5fill in blank

hard

Fill all three blanks to define a class with an instance field, a constructor that sets it, and a method that returns it.

C Sharp (C#)

public class Person {
    private string [1];
    public Person(string [2]) {
        this.name = [2];
    }
    public string GetName() {
        return [3];
    }
}

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Aname

Dperson

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for the field and parameter causing confusion.

Not using 'this' to distinguish the field from the parameter.

Returning a variable that does not exist.

The instance field is named 'name'. The constructor parameter is also 'name'. The method returns the field 'name'.