Else-if Statement

This type of statement is also known as 'Else-if' ladder. It is useful when you want to check more than one condition within a code.

If the condition of any 'If' block is True, then the statements associated with that block are executed. If none of the conditions are True, then the statements inside default else block are executed.

Syntax of Else-if Statement

if (test_expression 1)
    {
         Statement-1
         Statement-2.......
         Statement-N
     }
else if (test_expression 2)
            {
               Statement-1
               Statement-2.......
               Statement-N            
            }
               ... ... ...
           else if (test_expression N)
                      {
                             Statement-1
              	      Statement-2.......
                             Statement-N
                       }
else
{
    Statement-1
    Statement-2.......
    Statement-N
}

Flowchart of Else-If Statement

Examples

The following examples describe how to use the Else-If statement in PowerShell:

Example 1: In this example, we check a number is positive, negative, or zero.

PS C:\> $a=0
PS C:\> if ($a -gt 0)
>> {
>> echo "Number is positive"
>> } elseif($a -lt 0)
>> {
>> echo "Number is negative"
>> } else
>> {
>> echo " Number is zero"
>> }

Output:

Number is zero

Example 2: In this example, we find the grade of the student according to its percentage.

PS C:\> $math=80
PS C:\> $science=82
PS C:\> $english=75
PS C:\> $computer=90
PS C:\> $hindi=86
PS C:\> $total=$math+$science+$english+$computer+$hindi
PS C:\> $a=$total/500
PS C:\> $percentage=$a*100
PS C:\> if(($percentage -gt 90) -and ($percentage -le 100))
>> {
>> echo "Grade A"
>> } elseif(($percentage -gt 80) -and ($percentage -le 90))
>> {
>> echo "Grade B"
>> }elseif(($percentage -gt 70) -and ($percentage -le 80))
>> {
>> echo "Grade C"
>> }elseif(($percentage -gt 60) -and ($percentage -le 70))
>> {
>> echo "Grade D"
>> }elseif(($percentage -gt 50) -and ($percentage -le 60))
>> {
>> echo "Grade E"
>> }else{ echo "Fail"}

Output:

Grade B

Example 3: In this example, we check the greatest number among the three variables.

PS C:\> $a=10
PS C:\> $b=20
PS C:\> $c=30
PS C:\> if(($a -gt $b) -and ($a -gt $c))
>> { echo "The value of Variable 'a' is greater than the value of variable 'b' and 'c'."
>> }elseif(($b -gt $a) -and ($b -gt $c))
>> { echo "The value of Variable 'b' is greater than the value of variable 'a' and 'c'."
>> }elseif(($c -gt $b) -and ($c -gt $a))
>> { echo "The value of Variable 'c' is greater than the value of variable 'a' and 'b'."
>> }else
>> { echo " The value of all the three variables 'a', 'b', and 'c' are equal."
>> }

Output:

The value of Variable 'c' is greater than the value of variable 'a' and 'b'.

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