data:
x is number
y is number
result is number

procedure:
display "Enter x: "
accept x
display "Enter y: "
accept y
add x and y in result
display "x + y = " result lf
subtract y from x in result
display "x - y = " result lf
multiply x by y in result
display "x * y = " result lf
divide x by y in result       # There is no integer division but
floor result                  # floor rounds toward negative infinity
display "x / y = " result lf
modulo x by y in result
display "x % y = " result lf  # Returns the sign of the 2nd argument
raise x to y in result
display "x ^ y = " result lf