Operator precedence and evaluation order in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to correctly add 3 and 4, then multiply by 2.

C Sharp (C#)

int result = (3 + 4) [1] 2;
Console.WriteLine(result);

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

A/

B*

C-

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using + instead of * causes the result to be 9 instead of 14.

The multiplication operator (*) has higher precedence than addition, but parentheses force addition first. So (3 + 4) * 2 = 14.

2fill in blank

medium

Complete the code to check if 5 is greater than 3 and less than 10.

C Sharp (C#)

bool check = 5 [1] 3 && 5 < 10;
Console.WriteLine(check);

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A>

B<

C==

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > reverses the logic and results in false.

The expression 5 > 3 checks if 5 is greater than 3, which is true. Combined with 5 < 10, the whole expression is true.

3fill in blank

hard

Fix the error in the expression to correctly compute the value.

C Sharp (C#)

int value = 10 + 5 [1] 2;
Console.WriteLine(value);

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A/

B+

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using + instead of * causes the result to be 17 instead of 20.

Multiplication (*) has higher precedence than addition, so 5 * 2 is calculated first, then added to 10, resulting in 20.

4fill in blank

hard

Fill both blanks to create a dictionary with word lengths for words longer than 3 characters.

C Sharp (C#)

var lengths = new Dictionary<string, int> {
    {"apple", "apple".Length},
    {"bat", "bat".Length}
};
var filtered = lengths.Where(kv => kv.Value [1] 3).ToDictionary(kv => kv.Key, kv => kv.Value [2] 1);
foreach(var item in filtered) Console.WriteLine($"{item.Key}: {item.Value}");

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

A>

B+

C-

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > filters wrong words.

Using - instead of + decreases lengths incorrectly.

The filter keeps words with length greater than 3. Then it adds 1 to each length in the new dictionary.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase keys and values greater than 0.

C Sharp (C#)

var data = new Dictionary<string, int> { {"a", 1}, {"b", 0}, {"c", 3} };
var result = data.Where(kv => kv.Value [1] 0).ToDictionary(kv => kv.Key.[2](), kv => kv.[3]);
foreach(var item in result) Console.WriteLine($"{item.Key}: {item.Value}");

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A==

BValue

C>

DToUpper

Attempts:

3 left

💡 Hint

Common Mistakes

Using == filters only values equal to zero.

Using Key instead of Value for values causes errors.

The filter keeps entries with Value > 0. The keys are converted to uppercase using ToUpper(), and the values are kept as Value.