Give a formal expression of the specification, C/C++ Programming

A function REPAT is specified below.

Function REPAT(c in Char, i in Int, s in mString) return in mString pre 1 ≤ i ≤ the length of s. post The returned value is a string identical to s except that the character at index position i has been replaced by the character c.

For example, if s is "court" then REPAT('N',4, s) will be "couNt". For a non-empty string, t, let A(t) be the set

A(t) = {j in Int: (1 ≤ j) ∧ (j ≤ t.length( ))}.

In giving the formal expressions required in parts (b) and (d) below, you can use: methods of the class mString; type functions of Char and Int; the set A(t) (for any non-empty string t), and the usual notation of logic.

(a) Suppose that t is the string "riyht". For this string t, write down t.length, and enumerate the set of integers A(t)

(b) Suppose that s and w are non-empty strings of type mSring, c is of type Char and i is an integer form the set A(w).

Express formally each of the predicates in (i) and (ii) below. (i) The character at index position i in the string w is c.

(ii) For every integer j in the set A(s), if j is not equal to i then the characters at position j in the strings s and w are the same.

(c) Suppose that s is the string "riyht",c is the character 'g', w is the string "rightHo" and i is 3.

For these values of s, c, w and i, what is the truth value of each of the predicates in part (b) above?

 

Posted Date: 3/7/2013 2:22:14 AM | Location : United States







Related Discussions:- Give a formal expression of the specification, Assignment Help, Ask Question on Give a formal expression of the specification, Get Answer, Expert's Help, Give a formal expression of the specification Discussions

Write discussion on Give a formal expression of the specification
Your posts are moderated
Related Questions
Specifying a Class: As discussed a class is defined to develop an algorithm and bind it together in a core shell. A class is an abstract data type (ADT).  The binding of dat


While spending the summer as a surveyor’s assistant, you decide to write a program that transforms compass headings in degrees (0-360) to compass bearings. A compass bearing consis

Described the ISA and HASA class relationships. How would you apply each in a class design? A: A specialized class "is" specialization of another class and, thus, has the ISA re

Write a program IdentyfyWordsMain.java reading a fi le (like HistoryOfProgramming) and divide the text into a sequence of words (word=sequence of letters). Save the result in a new

Operator overloading - c++ program: Write a program in c to define operator overloading. class matrix{                   private :                 int x[2][2];

Within C we access external devices by means of a pointer i.e. address. The address could point to any memory mapped device i.e. Ram, Rom, Duart, Disk drives etc. Therefore there i

SquareMaze The SquareMaze class should be declared and defined in maze.h and maze.cpp, respectively. Each SquareMaze object will represent a randomly-generated square maze and its

When I develop a destructor, do I require to explicitly call the destructors for my member objects?

Create a C language code, only one program, to implement the following task. Task: Write C code for a program that implements a digital clock (HH:MM:SS). The clock inclu