1. Introduction
  2. Lesson 1: Getting Started with C#
  3. Lesson 2: Operators, Types, and Variables
    1. Variables and Types
    2. The Boolean Type
    3. Integral Types
    4. Floating Point and Decimal Types
    5. The string Type
    6. Escape Sequences
    7. C# Operators
    8. The Array Type
    9. Summary
  4. Lesson 3: Control Statements - Selection
    1. The if Statement
    2. The if-else statement
    3. The switch Statement
    4. Branching Statements
  5. Lesson 4: Control Statements - Loops
    1. The while Loop
    2. The do while Loop
    3. The for Loop
    4. The foreach Loop
  6. Lesson 5: Methods
    1. Method Structure
  7. Lesson 6: Namespaces
    1. Namespace Declaration
  8. Lesson 7: Introduction to Classes
    1. Classes
  9. Lesson 8: Class Inheritance
  10. Lesson 9: Polymorphism
    1. Polymorphism
  11. Lesson 10: Properties
    1. Overview of Properties
    2. Creating Auto-Implemented Properties
    3. Creating a Write-Only Property
    4. Creating Read-Only Properties
    5. Encapsulating Type State with Properties
    6. Traditional Encapsulation Without Properties
  12. Lesson 11: Indexers
    1. Indexers
    2. Overloaded Indexers
  13. Inheritance

4.1.The if Statement #

The if Statement

An if statement allows you to take different paths of logic, depending on a given condition. When the condition evaluates to a boolean true, a block of code for that true condition will execute. You have the option of a single if statement, multiple else if statements, and an optional else statement.

Listing 3-1. forms of the if statement (Single Selection)

using System;

namespace CSharp
{
        class if_Selection
        {
                static void Main(string[] args)
                {
                        float score;
                        Console.Write("Enter Score: ");
                        score = float.Parse(Console.ReadLine());
                        if (score >= 50)
                                Console.WriteLine("Passed");
                        Console.ReadKey();
                }        
        }
}

Example 1: Windows Forms Application:

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