Params keyword for variable arguments in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a method that accepts a variable number of integer arguments using the correct keyword.

C Sharp (C#)

public void PrintNumbers([1] int[] numbers) {
    foreach (int num in numbers) {
        Console.WriteLine(num);
    }
}

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

Aparams

Bargs

Cvariable

Dvarargs

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'varargs' which is not a C# keyword.

Forgetting to use any keyword and just writing 'int[] numbers'.

The params keyword allows a method to accept a variable number of arguments as an array.

2fill in blank

medium

Complete the method call to pass multiple integers to the method using the params keyword.

C Sharp (C#)

PrintNumbers([1]);

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

A1, 2, 3

Bnew int[] {1, 2, 3}

C{1, 2, 3}

Dint[] {1, 2, 3}

Attempts:

3 left

💡 Hint

Common Mistakes

Passing an array explicitly when not needed.

Using curly braces without 'new int[]'.

When a method uses params, you can pass multiple arguments separated by commas without creating an array explicitly.

3fill in blank

hard

Fix the error in the method declaration to correctly use the params keyword for variable arguments.

C Sharp (C#)

public void SumNumbers([1] int[] numbers) {
    int sum = 0;
    foreach (int num in numbers) {
        sum += num;
    }
    Console.WriteLine(sum);
}

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

Aout

Bparams

Cref

Din

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ref' or 'out' instead of 'params'.

Placing the keyword after the parameter name.

The params keyword must be placed before the array parameter to allow variable arguments.

4fill in blank

hard

Fill both blanks to declare a method that sums variable integer arguments and returns the total.

C Sharp (C#)

public int SumAll([1] int[] numbers) {
    int total = 0;
    foreach (int num in [2]) {
        total += num;
    }
    return total;
}

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

Aparams

Bnumbers

Cnums

Dargs

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different variable name in the loop than the parameter name.

Forgetting the 'params' keyword.

The method uses params before the array parameter name 'numbers'. Inside the method, you iterate over 'numbers'.

5fill in blank

hard

Fill all three blanks to declare a method that prints each string argument passed using the params keyword.

C Sharp (C#)

public void PrintAll([1] string[] [2]) {
    foreach (string [3] in [2]) {
        Console.WriteLine([3]);
    }
}

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

Aparams

Bwords

Cword

Dargs

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names between parameter and loop.

Omitting the 'params' keyword.

The method uses params before the string array parameter named 'words'. The foreach loop uses 'word' to iterate over 'words'.