Dive in to master Boolean expressions for precise C# coding, ensuring your apps handle user data flawlessly! Introduction The article discusses the foundational aspects of decision logic in C# programming, focusing on Boolean expressions, operators, and their importance for developers working on C# applications dealing with customer data and user inputs. Learning Objectives: Use operators to construct Boolean expressions for comparison and equality testing. Employ built-in string class methods for efficient string evaluations. Prerequisites for Developers Prior experience with basic coding tasks like variable instantiation, data type usage, and console output handling. Familiarity with constructs for conditional statements. if-else Understanding of using the Random class for generating random numbers. Proficiency in using or for creating and executing simple console applications. Visual Studio Visual Studio Code Getting Started What is an Expression? An expression in programming combines values, operators, and methods to produce a single result. In C#, expressions are used within statements, such as “if” statements, to make decisions based on or outcomes. Boolean expressions, which return or , are pivotal for directing code execution and determining which code blocks to run. Developers select operators like equality within Boolean expressions to compare values and guide program flow based on specific conditions and logic. true false true false (==) Equality Operator To begin, create a static class file called “ ” within the console application. Insert the provided code snippet into this file. Expressions.cs public static class Expressions
{
    /// <summary>
    /// Outputs
    /// True
    /// False
    /// False
    /// True
    /// </summary>
    public static void CheckEqualityOperator()
    {
        Console.WriteLine("a" == "a");
        Console.WriteLine("a" == "A");
        Console.WriteLine(1 == 2);

        string myValue = "a";
        Console.WriteLine(myValue == "a");
    }
} Execute the code from the main method as follows #region Day 1 - Expressions

using _30DayChallenge.Net.Day1;

Expressions.CheckEqualityOperator();

#endregion Console Output // Console Output
True
False
False
True Enhance the comparison We can improve the comparison for string equality by utilizing the string’s inherent helper functionalities. It may seem unexpected that the line returns false. Remember, string comparisons are case-sensitive. Console.WriteLine("a" == "A"); Let’s explore another scenario: Console.WriteLine("a" == "a "); In this example, a space is added at the end of one string. Consequently, this expression also yields false. Enhance the previous equality check by applying these helper methods to both values, as demonstrated in the following code snippet: /// <summary>
/// Outputs
/// True
/// </summary>
public static void CheckEqualityBuiltInMethods() {
    string value1 = " a";
    string value2 = "A ";
    Console.WriteLine(value1.Trim().ToLower() == value2.Trim().ToLower());
} Execute the code from the main method as follows #region Day 1 - Expressions

using _30DayChallenge.Net.Day1;

Expressions.CheckEqualityBuiltInMethods();

#endregion Console Output // Console Output
True Inequality Operator The inequality operator’s result is the reverse of what the equality operator yielded. Add another function to the class as follows Expressions.cs /// <summary>
/// Outputs
/// False
/// True
/// True
/// False
/// </summary>
public static void CheckInEqualityOperator()
{
    Console.WriteLine("a" != "a");
    Console.WriteLine("a" != "A");
    Console.WriteLine(1 != 2);

    string myValue = "a";
    Console.WriteLine(myValue != "a");
} Execute the code from the main method as follows #region Day 1 - Expressions

using _30DayChallenge.Net.Day1;

Expressions.CheckInEqualityOperator();

#endregion Console Output // Console Output
False
True
True
False Evaluating comparisons For numeric comparisons, utilize operators such as: Greater than (>) Less than (<) Greater than or equal to (>=) Less than or equal to (<=) Add another function to the class as follows Expressions.cs /// <summary>
/// Outputs
/// False
/// True
/// True
/// True
/// </summary>
public static void CheckComparisonOperator()
{
    Console.WriteLine(1 > 2);
    Console.WriteLine(1 < 2);
    Console.WriteLine(1 >= 1);
    Console.WriteLine(1 <= 1);
} Execute the code from the main method as follows #region Day 1 - Expressions

using _30DayChallenge.Net.Day1;

Expressions.CheckComparisonOperator();

#endregion Console Output // Console Output
False
True
True
True Boolean return type Certain methods in programming return a Boolean value ( or ). In this exercise, utilize a built-in method from the class to check if a larger string contains a specific word or phrase. true false String Add another function to the class as follows Expressions.cs /// <summary>
/// Check if method contains a substring
/// </summary>
public static void CheckBooleanMethods()
{
    string pangram = "The quick brown fox jumps over the lazy dog.";
    Console.WriteLine(pangram.Contains("fox"));
    Console.WriteLine(pangram.Contains("cow"));
} Execute the code from the main method as follows #region Day 1 - Expressions

using _30DayChallenge.Net.Day1;

Expressions.CheckBooleanMethods();

#endregion Console Output // Console Output
True
False C# Programming🚀 Thank you for being a part of the C# community! Before you leave: If you’ve made it this far, please show your appreciation with a clap and follow the author! 👏️️ Follow us: | | | | X LinkedIn Dev.to Hashnode Newsletter Visit our other platforms: | GitHub Instagram More content at C# Programming Also published . here

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The 30-Day .NET Challenge, Day 1: Boolean Expressions

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