Imports System

Public Module Module1

    Public Sub Main()

        dim depth as integer

        dim length,breadth,width,diameter as single

        dim shape,colour as string

        dim volume20 as double

        dim Number_of_slabs , Number_of_batches as integer

        console.writeline("enter number of slabs ")

        Number_of_slabs =console.readline()

        if Number_of_slabs <20 or Number_of_slabs >100 then 

            console.writeline ("invalid Number of slabs")

        else

            number_of_batches = Number_of_slabs\20

        end if

        if Number_of_slabs/20 > 0 then

            Number_of_batches = Number_of_batches+1

            console.writeline("the number of batches is "& Number_of_batches)

            end if 

        console.writeline("enter color")

        colour=console.readline()

        console.writeline("enter depth")

        depth=console.readline()

        if depth <> 38 or depth <> 45 then 

            console.writeline (" invalid depth")

            end if

        DO

        Console.WriteLine("Enter Shape")

        shape = console.readline()

        if shape ="square" then

            Console.WriteLine("square")

                console.writeline ("enter length")

                length=console.readline()

                console.writeline("enter width")

                width=console.readline()

                volume20=(length * width * depth * 20)/100000

                console.writeline("the volume of 20 square slabs is "& volume20)

        else

                if shape ="rectangle" then   

                Console.WriteLine("rec")

                    console.writeline("input length")

                    length=console.readline()

                    console.writeline("input width")

                    width=console.readline

                    volume20=(length * width * depth * 20)/100000

                    console.writeline(" the volume of 20 rectangular slabs is "& volume20)

            else

                if shape="round" then

                        console.writeline("round")

                        console.writeline("enter diameter")

                        diameter=console.readline()

                        volume20=(3.14 * (diameter/2) * (diameter/2) * depth * 20)/100000

                        console.writeline(" the volume of 20 circle slabs is "& volume20)

                    else 

                        console.writeline(" shape is not valid ")

                end if

            end if

        end if

        loop until shape="rectangle"  or shape="square" or shape ="round"

    End Sub

End Module