Positional patterns in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to match a point with coordinates (0, 0).

C Sharp (C#)

if (point is ([1], 0))
{
    Console.WriteLine("Point is on the Y axis.");
}

Drag options to blanks, or click blank then click option'

A1

B0

Cx

Dy

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name instead of a literal 0.

Using 1 instead of 0.

The pattern (0, 0) matches a point at the origin. Here, the first coordinate must be 0.

2fill in blank

medium

Complete the code to extract the X coordinate from a point using positional patterns.

C Sharp (C#)

if (point is ([1], int y))
{
    Console.WriteLine($"X coordinate is {x}");
}

Drag options to blanks, or click blank then click option'

Ax

Bvar x

C0

Dint x

Attempts:

3 left

💡 Hint

Common Mistakes

Using just 'x' without type.

Using 'var x' which is invalid in positional patterns.

To extract the X coordinate, declare it as int x in the pattern.

3fill in blank

hard

Fix the error in the positional pattern to correctly match a point with X > 0.

C Sharp (C#)

if (point is (int x, int y) && x [1] 0)
{
    Console.WriteLine("X is positive.");
}

Drag options to blanks, or click blank then click option'

A>

B<=

C==

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' which checks for negative values.

Using '==' which checks for equality.

The condition x > 0 checks if X is positive.

4fill in blank

hard

Fill both blanks to match a point where X equals Y.

C Sharp (C#)

if (point is ([1] x, [2] y) && x == y)
{
    Console.WriteLine("X equals Y.");
}

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Aint

Bvar

Cdouble

Dfloat

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing types like int and double.

Using 'var' which is not allowed in positional patterns.

Both X and Y should be declared as int to match integer coordinates.

5fill in blank

hard

Fill all three blanks to create a method that uses positional patterns to check if a point is at the origin.

C Sharp (C#)

bool IsOrigin((int x, int y) point) => point is ([1], [2]);

// Usage
var p = (0, 0);
Console.WriteLine(IsOrigin(p)); // [3]

Drag options to blanks, or click blank then click option'

A0

Btrue

Cfalse

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-zero values in the pattern.

Returning false instead of true for the origin.

The pattern (0, 0) matches the origin. The method returns true for point (0,0).