HW1: Postfix Calculator

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ECS 40 Homework 1: Postfix Calculator ECS 40 Homework 1: Postfix Calculator Due: Thursday, January 19 at 2200 hours. Check out: git clone metastasis@cancer.cs.ucdavis.edu:user/{username}/1/1 Hand out: Reference program: postfix (SHA-1: 955dc54f30c2e85215122ade7c75f8001d2f768a). Example input: postfix.test. Note: the reference program runs on only x86-64 Linux, where the command uname -m should output x86_64.
Reverse Polish notation (RPN) is a mathematical notation in which every operator follows all of its operands, in contrast to Polish notation, which puts the operator in the prefix position. It is also known as postfix notation and is parenthesis-free as long as operator arities are fixed. The description "Polish" refers to the nationality of logician Jan Ɓukasiewicz, who invented (prefix) Polish notation in the 1920s. Reverse Polish notation Reverse Polish notation
Postfix Calculator Postfix Calculator This calculator uses postfix notation. To use the calculator your browser requires JavaScript support. The calculator works a little differently from other calculators you may have used. Suppose you want to add two numbers. Enter the first number. Press "Enter."
Postfix Evaluation Postfix Evaluation Infix Expression : Any expression in the standard form like "2*3-4/5" is an Infix(Inorder) expression. Postfix Expression : The Postfix(Postorder) form of the above expression is "23*45/-". Postfix Evaluation :
A linked list whose nodes contain two fields: an integer value and a link to the next node. The last node is linked to a terminator used to signify the end of the list. The principal benefit of a linked list over a conventional array is that the list elements can easily be inserted or removed without reallocation or reorganization of the entire structure because the data items need not be stored contiguously in memory or on disk. Linked lists allow insertion and removal of nodes at any point in the list, and can do so with a constant number of operations if the link previous to the link being added or removed is maintained during list traversal. On the other hand, simple linked lists by themselves do not allow random access to the data, or any form of efficient indexing. Linked list Linked list
Stack (abstract data type) Simple representation of a stack A stack may be implemented to have a bounded capacity. If the stack is full and does not contain enough space to accept an entity to be pushed, the stack is then considered to be in an overflow state. The pop operation removes an item from the top of the stack. Stack (abstract data type)
Classes (I) Classes are an expanded concept of data structures: like data structures, they can contain data members, but they can also contain functions as members. An object Classes (I)
Introduction to C++ Classes Contents An Example C++ Class C++ classes are similar to Java classes in many ways, but there are also important differences. Below is an example of a C++ class named IntList to be used to represent a list of integers; operations to add a value to the end of the list and to print the list are provided. The implementation uses a dynamically allocated array to store the integers; when the array is full, a new array of twice the size is allocated. In Java, the class definition would all be in a single file. Introduction to C++ Classes
C++ classes Differences between struct and classes in C++[edit] In C++, a structure is a class defined with the struct keyword.[1] Its members and base classes are public by default. A class defined with the class keyword has private members and base classes by default. This is the only difference between structs and classes in C++. C++ classes
Object-Oriented C++ Class Design - CProgramming.com Object-Oriented C++ Class Design - CProgramming.com Understanding Interfaces When you're designing a class in C++, the first thing you should decide is the public interface for the class. The public interface determines how your class will be used by other programmers (or you), and once designed and implemented it should generally stay pretty constant. You may decide to add to the interface, but once you've started using the class, it will be hard to remove functions from the public interface (unless they aren't used and weren't necessary in the first place). But that doesn't mean that you should include more functionality in your class than necessary just so that you can later decide what to remove from the interface.
Friend functions In principle, private and protected members of a class cannot be accessed from outside the same class in which they are declared. However, this rule does not apply to "friends". Friends are functions or classes declared with the friend keyword. Friendship and inheritance
Classes (II) [NOTE: This chapter requires proper understanding of dynamically allocated memory] Special member functions are member functions that are implicitly defined as member of classes under certain circumstances. There are six: Let's examine each of these: Default constructor
Arrays An array is a series of elements of the same type placed in contiguous memory locations that can be individually referenced by adding an index to a unique identifier. That means that, for example, five values of type int can be declared as an array without having to declare 5 different variables (each with its own identifier). Instead, using an array, the five int values are stored in contiguous memory locations, and all five can be accessed using the same identifier, with the proper index. For example, an array containing 5 integer values of type int called foo could be represented as: where each blank panel represents an element of the array.
A simple C++ statement is each of the individual instructions of a program, like the variable declarations and expressions seen in previous sections. They always end with a semicolon (;), and are executed in the same order in which they appear in a program. But programs are not limited to a linear sequence of statements. During its process, a program may repeat segments of code, or take decisions and bifurcate. For that purpose, C++ provides flow control statements that serve to specify what has to be done by our program, when, and under which circumstances. Many of the flow control statements explained in this section require a generic (sub)statement as part of its syntax. Control Structures
C++ Operators
logical-or-expression || logical-and-expression The logical OR operator (||) returns the boolean value true if either or both operands is true and returns false otherwise. The operands are implicitly converted to type bool prior to evaluation, and the result is of type bool. Logical OR has left-to-right associativity. Logical OR Operator: ||
Delete an array element
Using cin.get, cin.getline, & cin.ignore
How to use EOF in C - C / C++
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How to concatenate two integer values
Infix, Postfix and Prefix