Understand Conditional Statement in C#

Introduction

Conditional statement is a set of Rule performed if a certain Condition met.
We can achieve this using IF-ELSE Statement.

Skeleton of IF-ELSE Statement

if(<condition-1>)
{
print message
}
else if(<condition-2>)
{
print message
}
else
{
print message

}

we can use only IF instead of IF-ELSE Statement as below.

if(<condition-1>)
{
print message
}
if(<condition-2>)
{
print message
}
if(<condition-3>)
{
print message

}

flowchart for if-else statement

The above chart describe as below algorithm.

Step 1. Start

Step 2. Read two number a,b

Step 3. if(a>b) then

print " a is greater"

Step 4. else if(a=b) then

print "Both are same"

Step 5. else(a>b) then

print " b is greater"

Step 6. End

Lets Convert this algorithm to a C# program.

using System;

namespace ConsoleApp1

{

class ifelsecheck

{

public void CheckIfElse()

{

int a, b = 0;

Console.WriteLine("Enter two number..");

a = Convert.ToInt16(Console.ReadLine());

b = Convert.ToInt16(Console.ReadLine());

if (a > b)

Console.WriteLine(a + " is bigger");

else if (a == b)

Console.WriteLine(a + " and " + b + " are equal");

else

Console.WriteLine(b + " is bigger");

Console.ReadKey();

}

}

}

Limitations

IF-ELSE check each and every condition till the condition is satisfied.

Performance will degrade if more condition is there in the statement.

ELSE is optional in the statement but IF is compulsory to use it.

The difference between IF and IF-ELSE is as below.

IF will check each and every condition

IF-ELSE will check till condition satisfied.

Thanks.......