// pseudo code for swap
// The following declares the following global integer variables

Declare Integer A, B, Temp

// the main module
Module main()
   // assign the global variables values
   Set A = 1
   Set B = 2
   Set Temp := 3

   Display "Before exchange ", A , B, Temp
   Exchange(A,B)
   Display "After exchange ", A, B, Temp
end Module

// Swaps the variables that were passed into the call by reference parameters
Module Exchange(Integer Ref X, Integer Ref Y)
   // Local Temp variable for the swap    
   Declare Integer Temp

   // Set the value of local temp variable
   Set Temp = X
   Set X = Y
   Set Y = Temp
   Display "Inside Exchange ", X, B, Temp)
End Module // Exchange