Скачать или смотреть PDS L18: Postfix Evaluation

Mrityunjay Shukla: *+12-34
SALMAN MUHAMMED ASLAM : *+12-34
G Saicharan : *+12-34
Kandra Pavan : *+12-34
Rishabh Tushar Shah : *+12-34
Shania Mitra : 12+34-*
S Aniruddha : 12+34-*
G Saicharan : 12+34-*
Kandra Pavan : 12+34-*
Nikhil Anand be20b022: 12+34-*
B V Murari : 12+34+*
Rishabh Tushar Shah : 12+43-*
Andrea Elizabeth Biju ae19b027: 12+34-
Andrea Elizabeth Biju ae19b027: 12+34-*
B V Murari : 12+34-*
Anish Kumar : +1*2-34
G Saicharan : +1*2-34
Vishwa be20b039: +1*2-34
SALMAN MUHAMMED ASLAM : +1*2-34
Nikhil Anand be20b022: +1*2-34
Andrea Elizabeth Biju ae19b027: +1*2-34
Rishabh Tushar Shah : +1*2-34
Basavalinganagowda Sreya ae19b002: + 1 * 2 – 3 4
Kandra Pavan : +1*2-34
S Aniruddha : +1*2-34
B V Murari : +1*2-34
Shania Mitra : +1*2-34
Bandaru Mani Chandana : +12*-34
Bandaru Mani Chandana : +1*2-34
Bandaru Mani Chandana : mistake
Shania Mitra : Postfix: 1234-*+
Andrea Elizabeth Biju ae19b027: 1234-*+
Nikhil Anand be20b022: 1234-*+
Kandra Pavan : 1234-*+
G Saicharan : 1234-*+
S Aniruddha : 1234-*+
Pulipati Hemanth ee18b116: 1234-*+
Vishwa be20b039: 1234-*+
B V Murari : 1234-*+
Basavalinganagowda Sreya ae19b002: 1234 - * +
Bandaru Mani Chandana : 1234-*+
Nikhil Anand be20b022: -+1*234
Shania Mitra : -+1*234
B V Murari : -+1*234
S Aniruddha : -+1*234
Anish Kumar : -+1*234
Mrityunjay Shukla: -+1*234
SALMAN MUHAMMED ASLAM : -+1*234
Andrea Elizabeth Biju ae19b027: -+1*234
Vishwa be20b039: -+1*234
Shania Mitra : Postfix: 123*+4-
Rohit Jayant Deshpande ce18b049: -+1*234
Virgillus Zita J : -+1*234
Bandaru Mani Chandana : +1*234; 123*+4
Andrea Elizabeth Biju ae19b027: 123*+4- postfix
B V Murari : 123*+4-
S Aniruddha : 123*+4-
Vishwa be20b039: 123*+4-
Anish Kumar : 123*+4-
G Saicharan : -+1*234
G Saicharan : 123*+4-
G Saicharan : can you repeat the question?
B V Murari : before that converting infix to prefix/postfix, this also can done in stack?
M Dhilipkumar ce18b010: iterate through expression if you encounter a number add to the stack. if it is a operator then take last two elements in stack and do the respective operation
Nikhil Anand be20b022: go term by term, when you see an operator, apply it to the last two elements and remove those elements and add the result to the stack
Kaustubh Tripathi ee18b053: Take an operator and if the preceding two characters are integers evaluate the expression and replace with that with am integer and repeat
Shania Mitra : maintain a stack, put the operands in the order they appear when an operator appears remove the top 2 elements do teh operation and then push the result back in the stack
Virgillus Zita J : push the result
Virgillus Zita J : push the result
Kaustubh Tripathi ee18b053: Just keep appending to the stack
Shania Mitra : if operands are not available, push the operator and continue
Rupesh Nasre.: 1 2 +
Kandra Pavan : Only in postfix case?
Bandaru Mani Chandana : How is that possible in postfix notation?
G Saicharan : I dont think it is possible in postfix
Mrityunjay Shukla: Can we use unary operatos in postfix?
B V Murari : I think it is not possible, bcs atleast 2 numbers before the operators are in pairs and hence can be calculated for a particular operator
Chhotu Kumar : -1+2 what will be the postfix for this
Bandaru Mani Chandana : No
Andrea Elizabeth Biju ae19b027: no we cannot
Shania Mitra : No
Kandra Pavan : 1234-*+ will have 4
G Saicharan : for Chhotu Kumar's question, cant we take a it as 0-1+2?
B V Murari : sir, how to write post / prefix if there are double digit number? should we include brackets now ?
S Aniruddha : we can use different symbol for unary and binary -
G Saicharan : for prefix evaluation, maybe we can pop when we encounter 2 consecutive numbers?
Anish Kumar : Can't we start reading the prefix expression from the end, adding elements in reverse order to the stack? Implementation would then be same
Shreyas N : 1234-*+ can also be written as 234-*1+ or 34-2*1+.. which one do we choose?
Kandra Pavan : Sir, can you repeat the algorithm once?
Andrea Elizabeth Biju ae19b027: popped nodes can also be operator?
G Saicharan : at the end stack should be empty?
Kaustubh Tripathi ee18b053: Length of stack will never exceed 3 ?
G Saicharan : or have only 1 element
Kandra Pavan : Stack should have final value
Madhur Jindal : contain 1 element
Anish Kumar : just the result should be in stack
Nikhil Anand be20b022: 11
G Saicharan : what are argc, argv?
G Saicharan : can we do int(c) like in python?
Kandra Pavan : How can we use the same name for two different methods, eval here is being used for two different functions ? eval(), eval( char c, &stack) ?
In cpp are func() and func(arg 1, arg 2) two distinct functions?
G Saicharan : okay sir
Shania Mitra : Sir could you explain where single colon is used and where double?
Shania Mitra : Sir what about the line below public, why is that a single colon?
Shania Mitra : Thank you sir
Rupesh Nasre.: http://www.cse.iitm.ac.in/~rupesh/tea...