EDUCBA

EDUCBA

MENUMENU
  • Free Tutorials
  • Free Courses
  • Certification Courses
  • 600+ Courses All in One Bundle
  • Login

C# if Statement

By Priya PedamkarPriya Pedamkar

Home » Software Development » Software Development Tutorials » C# Tutorial » C# if Statement

C# if Statement

Introduction to  C# if Statement

  • C# is a very powerful object-oriented programming language of.Net Framework. The .Net framework is an extensive, revolutionary platform using which the following applications such as Windows applications, Web applications, Web Services, etc can be easily developed.
  • There are multiple languages supported by this framework such as C#, C++, Visual Basic, etc. The applications developed using this framework are supported by multiple platforms. C# is one of the very popular languages of this framework.
  • C# is simple yet very powerful. It was created by Microsoft and using it we can create different types of applications based on our requirements such as web application, console application, windows application.

Let us understand the basic structure of the C# program before we jump to if statement.

To print C# if Statement as output.

Start Your Free Software Development Course

Web development, programming languages, Software testing & others

using System;   //declaring namespace
class Example1   //declaring class
{
static void Main(string[] args) {     //declaring class method
Console.WriteLine("C# IF STATEMENT");    //print
}
}

Output:

C# IF STATEMENT

This article basically focuses on the C# IF statement so let us get on with it step by step.

The “if” Statement

  • There are several decision-making statements available in C#  where certain logical conditions are required so that there is a continuous flow of a program. The decision making statements included in C# are – if statement, if-else statement, switch statement and ternary operator
  • The “if” condition or the if-else condition takes up a boolean expression as its parameter and evaluates it. Only if the condition being evaluated is true, the block of a statement under if the statement is executed. In case the condition is false the if block will be skipped.

C# if Statement in detail

The conditional if statement accepts a boolean expression or a condition inside brackets or as a parameter which is followed by a single line or multi-line block of code. During the runtime when the program has executed the condition inside the brackets is evaluated. If this boolean expression results in true then the code block following the if statement will be executed.

Consider the following example where the if condition contains true as an expression.

The syntax of the if the statement is –

if(a conditional statement or boolean expression)
{
// the block of code to be executed if the expression results into true
}

Popular Course in this category
C# Training Program (6 Courses, 17 Projects)6 Online Courses | 17 Hands-on Project | 89+ Hours | Verifiable Certificate of Completion | Lifetime Access
4.6 (8,847 ratings)
Course Price

View Course

Related Courses
ASP.NET Training (8 Courses, 19 Projects).NET Training Program (4 Courses, 19 Projects)

Let us understand this further with an example.

Consider –

using System;
class Ex2
{
static void Main(string[] args)
{
{
if(true)
Console.WriteLine("True Condition: We are inside the for loop");
if(false)
Console.WriteLine("False Condition: We will not be able to enter inside the for loop");
}
}
}

  • As explained above, if the statement contains a condition that would result in true or false. The execution of the code associated with the if loop depends on this boolean expression. Consider the example with the problem statement given below for further clarification –
  • Problem Statement: Ravi’s age (R_age) is 15 years. Amar’s age(A_age) is 12 years. Print if Ravi is elder or younger or equal to Amar.

For Example –

using System;
class Ex3
{
static void Main(string[] args)
{
int R_age = 15, A_age = 12;
if ( R_age > A_age)
Console.WriteLine("Ravi is elder to Amar");
if (R_age < A_age)
Console.WriteLine("Ravi is younger than Amar");
if (R_age == A_age)
Console.WriteLine("Ravi is of the same age as Amar");
}
}

The output of this code will be – Ravi is elder to Amar

Note that the boolean expression in the first ‘if’ statement is given as a parameter evaluates to be true as Ravi’s age(15) is greater than Amar’s age(12). As only one if statement holds true only the first block will be executed associated with the first if condition.

if-else Statement

The second type of conditional statement provided by C# is the if-else statement. The second part of the code which needs to execute if the condition holds false can be kept inside the else block. The else block cannot exist independently. This means that the else statement must follow an if-statement or else if statement. An else statement can only be used once in an if-else statement chain.

The syntax of the if-else statement is –

if(a conditional statement or boolean expression)
{
// the block of code to be executed if the expression results into true
}
else
{
// executes when “if” exp is false
}

  • As observed, the else statement does not contain any boolean expression. The block of code following the else statement is always executed whenever the condition is given in the ‘if’ brackets evaluates to be false.
  • We will consider the example of Ravi and Amar’s age as our problem statement for further clarification –

For Example –

using System;
class Ex4
{
static void Main(string[] args)
{
int R_age = 12, A_age = 15;
if ( R_age > A_age)
Console.WriteLine("Ravi is elder to Amar");
else
Console.WriteLine("Ravi and Amar are of the same age");
}
}

The output of this code will be –   Ravi and Amar are of the same age

By now you must have noticed that the boolean expression in the first ‘if’ statement given as a parameter evaluates to be false as Ravi’s age(12) is less than Amar’s age(15). Like the if statement holds false the second block i.e the code block associated with the else condition will be executed.

else if Statement

The second type of conditional statement provided by C# is else if statement. If the given conditions to be checked are more than one than the else-if conditions come into the picture.

Consider –

using System;
class Ex5
{
static void Main(string[] args)
{
int R_age = 12, A_age = 15;
if ( R_age > A_age)
Console.WriteLine("Ravi is elder");
else if (R_age < A_age)
Console.WriteLine("Ravi is younger");
else
Console.WriteLine("Ravi is of the same age as Amar");
}
}

Output: Ravi is younger

Nested If

Nested if the statement is an if statement within an if statement.

For Example –

using System;
class Ex6
{
static void Main(string[] args)
{
int R_age = 12, A_age = 15;
if(R_age != A_age) //yields true as 12 is not equal to 15
{
if( R_age < A_age) //enters inside this
Console.WriteLine("Ravi is younger");
else
Console.WriteLine("Ravi is elder");
}
}
}

Output:

Ravi is younger

Conclusion

The if-else or else-if statement evaluates the boolean expression and based on the result controls the flow of the program.

Recommended Articles

This has been a guide to C# if Statement. Here we also discuss an introduction, the basic structure of the C# program, IF statement, If-else, Else-if, Nested if with their sample code examples. You can also go through our other suggested articles to learn more –

  1. What is Multithreading in C#?
  2. C# Commands
  3. Uses Of C#
  4. Career in C Programming

C# Training Program (6 Courses, 17 Projects)

6 Online Courses

17 Hands-on Project

89+ Hours

Verifiable Certificate of Completion

Lifetime Access

Learn More

1 Shares
Share
Tweet
Share
Primary Sidebar
C sharp Tutorial
  • Control Statement
    • C# if Statement
    • Else If in C#
    • Continue in C#
    • Break in C#
    • Switch Statement in C#
    • Goto Statement in C#
  • Basic
    • Uses Of C#
    • C# Versions
    • C# Data Types
    • Variables in C#
    • Namespaces in C#
    • C# Compilers
    • C# Keywords
    • Iterators in C#
    • Objects in C#
    • C# Object Dispose
    • C# object to XML
    • C# check object type
    • C# Object Serialization
    • Pointers in C#
    • C# Literals
    • C# Commands
    • C# Custom Attribute
    • Type Casting in C#
    • String vs String C#
    • C# Struct vs Class
  • Operators
    • Logical Operators in C#
    • Conditional Operators in C#
    • Bitwise Operators in C#
    • C# OR Operator
    • C# Ternary Operators
    • Operator Precedence in C#
  • Loops
    • C# For Loop
    • C# While Loop
    • C# do-while loop
    • C# foreach Loop
  • Arrays
    • Arrays in C#
    • 2D Arrays in C#
    • C# Jagged Arrays
    • String Array in C#
    • C# Multidimensional Arrays
  • Constructor and Destructor
    • Constructor in C#
    • Copy Constructor in C#
    • Static Constructor in C#
    • Destructor in C#
  • overloading and overrideing
    • Overloading and Overriding in C#
    • Overloading in C#
    • Overriding in C#
    • Method Overloading in C#
    • Method Overriding in C#
    • Operator Overloading in C#
  • Functions
    • C# Functions
    • C# String Functions
    • Math Functions in C#
    • Recursive Function in C#
    • C# Anonymous Functions
    • C# Local Functions
    • Enum in C#
    • Trim() in C#
    • clone() in C#
    • C# random
    • C# String Format()
    • C# String Interpolation
    • C# StartsWith()
    • C# String IndexOf()
    • DateTime in C#
    • C# Nullable
    • C# nameof
    • C# checked
    • C# String PadLeft
    • Convert String to Double in C#
    • Convert int to String C#
    • String to Date C#
    • C# intern()
    • C# Stopwatch
    • C# DirectoryInfo
    • C# Compare()
    • C# Base
    • C# SOAP
    • Lock in C#
  • Advanced
    • Inheritance in C#
    • Exception Handling in C#
    • Types of Exception in C#
    • C# FileNotFoundException
    • C# NullReferenceException
    • C# OutOfMemoryException
    • C# StackOverflowException
    • Custom Exception in C#
    • What is Multithreading in C#
    • C# finally
    • C# System.IO
    • What is StringBuilder in C#
    • DataReader C#
    • BinaryWriter in C#
    • C# BinaryReader
    • TextWriter in C#
    • TextReader in C#
    • C# StringReader
    • C# StringWriter
    • C# StreamReader
    • C# StreamWriter
    • C# FileInfo
    • What is Design Pattern in C#?
    • Multithreading in C#
    • Sorting in C#
    • Bubble Sort in C#
    • C# SortedList
    • C# SortedSet
    • C# SortedDictionary
    • Abstract Class in C#
    • Access Modifiers in C#
    • C# Generics
    • Deserialization in C#
    • C# Thread
    • C# Thread Join
    • C# Thread Sleep
    • C# Thread Synchronization
    • C# Class
    • Sealed in C#
    • Sealed Class in C#
    • Polymorphism in C#
    • C# Call By Reference
    • Virtual Keyword in C# 
    • Yield Keyword in C#
    • Regular Expression in C#
    • C# Lambda Expression
    • C# Predicate
    • Convert Object to JSON C#
    • Checkbox in C#
    • C# MessageBox
    • Collections in C#
    • List in C#
    • C# LinkedList
    • Listbox in C#
    • Protected in C#
    • C# EventHandler
    • Private in C#
    • this Keyword in C#
    • Static Keyword in C#
    • C# Out Parameter
    • Assert in C#
    • C# Delegates
    • C# Interface
    • Generics in C#
    • Timer in C#
    • C# Serialization
    • Metadata in C#
    • C# Stack
    • C# Using Static
    • Queue in C#
    • C# File.Exists
    • C# Tuples
    • C# Create JSON Object
    • Partial in C#
    • C# readonly
    • C# Action Delegate
    • C# Await Async
    • C# Dictionary
    • IEnumerable C#
    • C# Data Grid View
    • C# Dynamic
    • Web Services in C#
    • C# Pattern Matching
    • C# Extension Methods
    • C# XmlSerializer
  • Programs
    • Patterns in C#
    • Swapping in C#
    • Palindrome in C#
    • Factorial in C#
    • Fibonacci Series in C#
    • Random Number Generator in C#
    • Prime Numbers in C#
    • Armstrong Number in C#
    • Reverse String in C#
  • Interview questions
    • C# Interview Questions and Answers
    • C# OOP Interview Questions
    • C# Design Pattern Interview Questions

Related Courses

C# Certification Training

ASP.NET Course

.NET Course

Footer
About Us
  • Blog
  • Who is EDUCBA?
  • Sign Up
  • Corporate Training
  • Certificate from Top Institutions
  • Contact Us
  • Verifiable Certificate
  • Reviews
  • Terms and Conditions
  • Privacy Policy
  •  
Apps
  • iPhone & iPad
  • Android
Resources
  • Free Courses
  • Java Tutorials
  • Python Tutorials
  • All Tutorials
Certification Courses
  • All Courses
  • Software Development Course - All in One Bundle
  • Become a Python Developer
  • Java Course
  • Become a Selenium Automation Tester
  • Become an IoT Developer
  • ASP.NET Course
  • VB.NET Course
  • PHP Course

© 2020 - EDUCBA. ALL RIGHTS RESERVED. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.

EDUCBA Login

Forgot Password?

EDUCBA
Free Software Development Course

Web development, programming languages, Software testing & others

*Please provide your correct email id. Login details for this Free course will be emailed to you
Book Your One Instructor : One Learner Free Class

Let’s Get Started

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy

EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you
EDUCBA
Free Software Development Course

Web development, programming languages, Software testing & others

*Please provide your correct email id. Login details for this Free course will be emailed to you

Special Offer - C# Training Program (6 Courses, 17 Projects) Learn More