Multi-parameter indexers in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a multi-parameter indexer that returns an integer.

C Sharp (C#)

public int this[int [1], int col] { get { return data[row, col]; } }

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Arow

Bindex

Ci

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a parameter name that does not match the usage inside the getter.

Using a single parameter instead of two.

The indexer uses row as the first parameter name to access the data array.

2fill in blank

medium

Complete the code to set a value using the multi-parameter indexer.

C Sharp (C#)

public int this[int row, int [1]] { set { data[row, col] = value; } }

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Acol

Bindex

Cpos

Dcolumn

Attempts:

3 left

💡 Hint

Common Mistakes

Using a parameter name that does not match the setter's code.

Using a single parameter instead of two.

The second parameter is named col to match the setter's usage.

3fill in blank

hard

Fix the error in the indexer declaration by completing the parameter list.

C Sharp (C#)

public string this[[1]] { get { return matrix[row, col]; } }

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Aint index

Bint row, int col

Cstring key

Dint x, int y, int z

Attempts:

3 left

💡 Hint

Common Mistakes

Using only one parameter for a 2D indexer.

Using incorrect parameter types.

The indexer requires two integer parameters to access the 2D matrix.

4fill in blank

hard

Fill both blanks to complete the multi-parameter indexer that sets a value in a 2D array.

C Sharp (C#)

public double this[[1], [2]] { set { grid[row, col] = value; } }

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Aint row

Bint index

Cint col

Ddouble val

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-integer parameter types.

Using parameter names that do not match the setter.

The indexer parameters must be int row and int col to match the grid indices.

5fill in blank

hard

Fill all three blanks to complete the multi-parameter indexer with get and set accessors for a 3D array.

C Sharp (C#)

public char this[[1], [2], [3]] { get { return cube[x, y, z]; } set { cube[x, y, z] = value; } }

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Aint x

Bint y

Cint z

Dchar c

Attempts:

3 left

💡 Hint

Common Mistakes

Using fewer than three parameters.

Using incorrect parameter types or names.

The indexer requires three integer parameters x, y, and z to access the 3D array.