Interpreter

Start of Interpreter for program P7.tri at Wed Apr 23 12:39:36 2003
Program
# READ a
READ b
READ c
F:=((a*(b+(2*c)))/2)
WRITE F#
Parsing tree
root
READ
a
READ
b
READ
c
:=
F /
*
a +
b *
2 c
2
WRITE
F
Table of constants
c1=2
Table of identifiers
i1=a i2=b i3=c i4=F

Modified tree
root
READ
a
READ
b
READ
c
:=
F /
*
a +
b *
2 c
2
WRITE
F

Stack id a=0
interpreting the operator READ a
READ
a
READ
b
READ
c
:=
F /
*
a +
b *
2 c
2
WRITE
F
Input a=5

Stack

Stack id b=0
interpreting the operator READ b
READ
b
READ
c
:=
F /
*
a +
b *
2 c
2
WRITE
F
Input b=3

Stack

Stack id c=0
interpreting the operator READ c
READ
c
:=
F /
*
a +
b *
2 c
2
WRITE
F
Input c=2

Stack

Stack id F=0

Stack id F=0 id a=5

Stack id F=0 id a=5 id b=3

Stack id F=0 id a=5 id b=3 const=2

Stack id F=0 id a=5 id b=3 const=2 id c=2
interpreting the operator (2*c)
*
2 c

4 = 2 * 2

Stack id F=0 id a=5 id b=3 tm=4
interpreting the operator (b+(2*c))
+
b *
2 c

7 = 3 + 4

Stack id F=0 id a=5 tm=7
interpreting the operator (a*(b+(2*c)))
*
a +
b *
2 c
2

35 = 5 * 7

Stack id F=0 tm=35

Stack id F=0 tm=35 const=2
interpreting the operator ((a*(b+(2*c)))/2)
/
*
a +
b *
2 c
2

17 = 35 / 2

Stack id F=0 tm=17
interpreting the operator F:=((a*(b+(2*c)))/2)
:=
F /
*
a +
b *
2 c
2
WRITE
F

F:=17

Stack

Stack id F=17
interpreting the operator WRITE F
WRITE
F
Output F=17

Stack
program P7.tri is completed
THE VARIABLES:
a=5
b=3
c=2
F=17
Interpreter ended at Wed Apr 23 12:39:46 2003