String comparison and equality in C Sharp (C#) - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this string equality check?

Consider the following C# code snippet. What will be printed to the console?

C Sharp (C#)

string a = "Hello";
string b = "hello";
Console.WriteLine(a == b);

A False

B True

C Compilation error

D Runtime exception

💡 Hint

Remember that string equality with == is case-sensitive by default.

The == operator compares strings with case sensitivity, so "Hello" and "hello" are not equal.

❓ Predict Output

intermediate

What does this code print when comparing strings ignoring case?

What will be the output of this C# code?

C Sharp (C#)

string a = "Test";
string b = "test";
bool result = string.Equals(a, b, StringComparison.OrdinalIgnoreCase);
Console.WriteLine(result);

A Compilation error

B False

C True

D Runtime exception

💡 Hint

Check the StringComparison option used in string.Equals.

Using StringComparison.OrdinalIgnoreCase makes the comparison ignore case differences, so the strings are equal.

❓ Predict Output

advanced

What is the output of this string reference comparison?

Analyze the following C# code and determine what it prints.

C Sharp (C#)

string s1 = "hello";
string s2 = new string(new char[] {'h','e','l','l','o'});
Console.WriteLine(object.ReferenceEquals(s1, s2));

A False

B Compilation error

C Runtime exception

D True

💡 Hint

ReferenceEquals checks if both variables point to the same object in memory.

s1 and s2 have the same content but are different objects, so ReferenceEquals returns false.

❓ Predict Output

advanced

What does this code print when comparing strings with Compare method?

What will be the output of this C# code snippet?

C Sharp (C#)

string a = "apple";
string b = "banana";
int result = string.Compare(a, b, StringComparison.Ordinal);
Console.WriteLine(result);

A Compilation error

B Zero

C A positive number

D A negative number

💡 Hint

Compare returns a negative number if the first string is less than the second.

"apple" comes before "banana" lexicographically, so Compare returns a negative number.

❓ Predict Output

expert

What is the output of this culture-sensitive string comparison?

Consider this C# code. What will it print?

C Sharp (C#)

using System.Globalization;
System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("de-DE");

string s1 = "straße";
string s2 = "strasse";
bool result = string.Equals(s1, s2, StringComparison.CurrentCultureIgnoreCase);
Console.WriteLine(result);

A False

B True

C Compilation error

D Runtime exception

💡 Hint

In German culture, "ß" is considered equivalent to "ss" in comparisons.

Using CurrentCultureIgnoreCase with German culture treats "straße" and "strasse" as equal ignoring case.