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Q. Write down an algorithm to evaluate an expression given to you in postfix notation. Show the execution of your algorithm for the following given expression.
AB^CD-EF/GH+/+*
Ans.
Algorithm to evaluate Post fix Expression is shown as follows
Opndstk = the empty stack;
/*scan the input string reading one */
/*element at a time into symb */
while ( not end of input){
symb = next input character;
if (symb is an operand)
push (opndstk, symb);
else
{
/* symb is an operator */
opnd 2 = Pop (opnd stk);
opnd 1 = Pop (opnd stk);
value = result of applying symb to opnd 1 and opnd 2;
push (opndstk,value);
}/*end else */
}/*end while */
return (pop (opnd stk));
Symb
Opnd1
Opnd2
Value
Opndstk
A
B
A,B
^
A^B
C
A^B,C
D
A^B,C,D
-
C-D
A^B,C-D
E
A^B,C-D,E
F
A^B,C-D,E,F
/
E/F
A^B,C-D,E/F
G
A^B,C-D,E/F,G
H
A^B,C-D,E/F,G,H
+
G+H
A^B,C-D,E/F,G+H
(E/F)/(G+H)
A^B,C-D, (E/F) /(G+H)
(C-D)+(E/F)/(G+H)
A^B,(C-D)+
*
(C-
D)+(E/F)/(G+H)
A^B*((C-D)+
(E/F)/(G+H))
i:=1 while(i { x:=x+1; i:=i+1; }
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