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Evaluate the following postfix expressions by using the algorithm we discussed in the videos/pdfs.  Show the status of the stack after each step of the algorithm.  Use the following values: a=7, b=3, c=12, d=-5, e=1: A.) a b c + - B) a b c - d * +

Evaluate the following postfix expressions by using the algorithm we discussed in the videos/pdfs.  Show the status of the stack after each step of the algorithm.  Use the following values: a=7, b=3, c=12, d=-5, e=1: A.) a b c + - B) a b c - d * +

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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USING C++

  1. Evaluate the following postfix expressions by using the algorithm we discussed in the videos/pdfs.  Show the status of the stack after each step of the algorithm.  Use the following values: a=7, b=3, c=12, d=-5, e=1:

A.) a b c + -

B) a b c - d * +

PLEASE LOOK AT THE IMAGES FOR FURTHER HELP!

 

postfix calculator |// calculate a string containing postfix expression |// at loop end, the result will be at the top of the stack 234 + * for (each character ch in the string) { if (ch is an operand) stack.push(ch) else // ch is an operator named op { // compute result of applying operator to the top // two elements and push result on stack operand stack.pop() operandl = stack.peek() stack.pop() = stack.peek () result = operandl op operand2 stack.push (result) stack result operand1 operand2
Transcribed Image Text:postfix calculator |// calculate a string containing postfix expression |// at loop end, the result will be at the top of the stack 234 + * for (each character ch in the string) { if (ch is an operand) stack.push(ch) else // ch is an operator named op { // compute result of applying operator to the top // two elements and push result on stack operand stack.pop() operandl = stack.peek() stack.pop() = stack.peek () result = operandl op operand2 stack.push (result) stack result operand1 operand2
converting infix to postfix 1. if you encounter an operand, append it to the output string postfixExp 2. if you encounter a "(", push it onto the stack 3. if you encounter an operator: 1. if the stack is empty, push it onto the stack a-(b+c*d)/e 2. else, peek at the stack. if it is an operator of greater or equal precedence, pop it from the stack and append it to postfixExp. keep peeking/popping until you encounter either a "(" or an operator of lower precedence, or the stack becomes empty. then, push the operator onto the stack ( 4. if you encounter a ")", pop operators off the stack and append them to postfixExp until you encounter the "(". pop off the "(" stack 5. if you encounter the end of the string, pop off remaining stack operators and append them to postfixExp abc postfixExp
Transcribed Image Text:converting infix to postfix 1. if you encounter an operand, append it to the output string postfixExp 2. if you encounter a "(", push it onto the stack 3. if you encounter an operator: 1. if the stack is empty, push it onto the stack a-(b+c*d)/e 2. else, peek at the stack. if it is an operator of greater or equal precedence, pop it from the stack and append it to postfixExp. keep peeking/popping until you encounter either a "(" or an operator of lower precedence, or the stack becomes empty. then, push the operator onto the stack ( 4. if you encounter a ")", pop operators off the stack and append them to postfixExp until you encounter the "(". pop off the "(" stack 5. if you encounter the end of the string, pop off remaining stack operators and append them to postfixExp abc postfixExp
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