(Postfix notation) Postfix notation is a way of writing expressions without using parentheses. For example, the expression (1 + 2) 3 would be writ- ten as 1 2 + 3 *. A postfix expression is evaluated using a stack. Scan a postfix expression from left to right. A variable or constant is pushed to the stack. When an operator is encountered, apply the operator with the top two operands in the stack and replace the two operands with the result. The follow- ing diagram shows how to evaluate 1 2 + 3 *. 1. 3 3 9. 12 + 3 * 12 + 3* 12+3* 12 + 3* 12 +3* scanned scanned scanned scanned scanned Write a program that prompts the user to enter a postfix expression and evalu- ates it.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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(Postfix notation) Postfix notation is a way of writing expressions without
using parentheses. For example, the expression (1 + 2) 3 would be writ-
ten as 1 2 + 3 *. A postfix expression is evaluated using a stack. Scan a
postfix expression from left to right. A variable or constant is pushed to the
stack. When an operator is encountered, apply the operator with the top two
operands in the stack and replace the two operands with the result. The follow-
ing diagram shows how to evaluate 1 2 + 3 *.
1.
3
3
9.
12 + 3 *
12 + 3*
12+3*
12 + 3*
12 +3*
scanned
scanned
scanned
scanned
scanned
Write a program that prompts the user to enter a postfix expression and evalu-
ates it.
Transcribed Image Text:(Postfix notation) Postfix notation is a way of writing expressions without using parentheses. For example, the expression (1 + 2) 3 would be writ- ten as 1 2 + 3 *. A postfix expression is evaluated using a stack. Scan a postfix expression from left to right. A variable or constant is pushed to the stack. When an operator is encountered, apply the operator with the top two operands in the stack and replace the two operands with the result. The follow- ing diagram shows how to evaluate 1 2 + 3 *. 1. 3 3 9. 12 + 3 * 12 + 3* 12+3* 12 + 3* 12 +3* scanned scanned scanned scanned scanned Write a program that prompts the user to enter a postfix expression and evalu- ates it.
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