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[vbdrita]

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The algorithm for creating a postfix expression is as follows: The program should read the expression into StringBuffer infix, and use one of the stack classes implemented in this chapter to help create the postfix expression in StringBuffer postfix. The postfix version of the preceding infix expression is (note that no parenthesis are needed) Write class InfixToPostfixConverter to convert an ordinary infix arithmetic expression (assume a valid expression is entered) with single-digit integers such as

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In a later exercise, you will discover that code you write in this exercise can help you implement a complete working compiler. In the next exercise, you will write a Java version of the postfix expression evaluation algorithm. In this exercise, you will write a Java version of the infix-to-postfix conversion algorithm. Each algorithm uses a stack object in support of its operation, and in each algorithm the stack is used for a different purpose. Each of these algorithms requires only a single left-to-right pass of the expression. To evaluate a complex infix expression, a compiler would first convert the expression to postfix notation, and then evaluate the postfix version of the expression. The preceding infix expressions would appear in postfix notation as 3 4 + and 7 9 /, respectively. Computers "prefer" postfix notation in which the operator is written to the right of its two operands. Humans generally write expressions like 3 + 4 and 7 / 9 in which the operator ( + or / here) is written between its operands–this is called infix notation. In this and the next exercise, we investigate how compilers evaluate arithmetic expressions consisting only of constants, operators and parentheses. The program should ignore spaces and punctuation.Ģ2.12 Stacks are used by compilers to help in the process of evaluating expressions and generating machine language code. The program should calculate the sum of the elements and the floating-point average of the elements.Ģ2.9 Write a program that creates a linked list object of 10 characters, then creates a second list object containing a copy of the first list, but in reverse order.Ģ2.10 Write a program that inputs a line of text and uses a stack object to print the line reversed.Ģ2.11 Write a program that uses a stack to determine if a string is a palindrome (i.e., the string is spelled identically backward and forward). Method merge of class ListMerge should receive references to each of the list objects to be merged, and should return a reference to the merged list object.Ģ2.8 Write a program that inserts 25 random integers from 0 to 100 in order into a linked list object. Class ListConcat should include method concatenate that takes references to both list objects as arguments and concatenates the second list to the first list.Ģ2.7 Write a program that merges two ordered list objects of integers into a single ordered list object of integers. Because college faculty use these exercises in their exams, we have provided answers to roughly half of the exercises included here.Ģ2.6Write a program that concatenates two linked list objects of characters. Answers are provided for those exercises whose exercise number is a hyperlink. Included below are short-answer and programming exercises.