Validation and error trapping

1. 

Pseudocode

Calculate price of sending parcel

Prompt user for ItemWeight, CostPerKilo

Get ItemWeight, CostPerKilo

If ItemWeight is a number and CostPerKilo is a number
 

CostofSendingParcel = ItemWeight * CostPerKilo

If CostofSendingParcel < 100

Display CostofSendingParcel

Else

CostAfterDiscount = CostofSendingParcel * 0.9

Display CostAfterDiscount

End If

Else Display ErrorMessage
 

End
2.