extend the C++ code below and use it as a starting point

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#include

#include

using namespace std;

// --------- BaseSig class and methods ------------------------------

class BaseSig{

private:

// neither derived classes nor other users

// can access private members

protected: // accessible by derived classes, not by other users.

int length;

int *raw_data;

public:

BaseSig(); // default constructor.

BaseSig(int L); // parametric constructor

virtual ~BaseSig(); // virtual destructor

int getLength() { return length; };

int getRawValue(int pos);

static int numObjects; // static, only one member for the entire hierarchy

virtual void printInfo();

};

int BaseSig::numObjects = 0; // initialize static data member

// Base class constructor

BaseSig::BaseSig(){

length = 0;

raw_data = NULL;

numObjects++;

}

// Base class parametric constructor

// Note that the data array is not being initialized (we could read from a file)

BaseSig::BaseSig(int L){

length = L;

raw_data = new int[L];

if(raw_data == NULL)

cerr << "Error in memory allocation";

numObjects++;

}

// Base class destructor

BaseSig::~BaseSig(){

delete raw_data;

cout << "Goodbye, BaseSig." << endl;

}

int BaseSig::getRawValue(int pos) {

if(pos < 0) // invalid index

return(raw_data[0]);

else if(pos >= length) // invalid index

return(raw_data[length-1]);

else

return(raw_data[pos]);

}

void BaseSig::printInfo() {

cout << " Length: " << length << endl;

}

// ------------------------------------------------------------------

// --------- ExtendSig class and methods ----------------------------

class ExtendSig : public BaseSig{ // ExtendSig is derived from class BaseSig

//BaseSig is a public base class

private:

double average; // add new data members

double *data;

public:

ExtendSig(int L); //derived classes need a new constructor

~ExtendSig();

// define new member functions

double getValue(int pos);

int setValue(int pos, double val);

double getAverage();

// redefine member function. Virtual keyword not needed

void printInfo(); // new standard: explicit "override" keyword can be used

};

// Derived class constructor. Note how the Base constructor is called.

ExtendSig::ExtendSig(int L) : BaseSig(L) {

data = new double[L];

if(data == NULL)

cerr << "Error in memory allocation";

else{

for(int i = 0; i < L; i++)

data[i] = (double)raw_data[i];

average = getAverage();

}

}

// Derived class destructor

ExtendSig::~ExtendSig() {

delete data;

cout << "Goodbye, ExtendSig." << endl;

}

double ExtendSig::getValue(int pos) {

if(pos < 0) // invalid index

return(data[0]);

else if(pos >= length) // invalid index

return(data[length-1]);

else

return(data[pos]);

}

int ExtendSig::setValue(int pos, double val) {

if((pos < 0) || (pos >= length))

return(-1); // invalid index

else {

data[pos] = val;

average = getAverage();

return(0); // success

}

}

double ExtendSig::getAverage() {

if(length == 0)

return(0.0);

else {

double temp = 0.0;

for(int i = 0; i < length; i++)

temp += data[i];

return(temp/(double)length);

}

}

// Redefined printInfo function for derived class

void ExtendSig::printInfo() {

cout << " Length: " << length << endl

<< "Average: " << average << endl;

}

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Modify and/or add code to the BaseSig class to read data in from a file . Dont worry about command line arguments or constructors that take in a string with the name of the file or the file number. Assume a default text file to read from.

Code up a derived ProcessedSignal class (derived from BaseSig). This class should have the data members and methods that class ExtendSig has, and the following additional ones:

Maximum value data member (private)

Minimum value data member (private)

Methods to get the maximum and minimum values (public). Methods like these are called getters.

Normalization method (public)

Redefinition of the printInfo method, which should display the data members: length, average, maximum value, minimum value.

Please help and comment the code so I can understand it !