Question: 2 . Write a program to read and evaluate a postfix expression. USE THE STACKPAC.h library. Suppose a = 5 , b = 7

2. Write a program to read and evaluate a postfix expression. USE THE "STACKPAC.h" library. Suppose a=5, b=7, c=8, d=2 Sample I/O
Enter a postfix expression: ab*c+d-$
Value = xx
CONTINUE(y/n)? y
Enter a postfix expression: aa+b*c-d+$
Value = xx
CONTINUE(y/n)? n

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