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PFArrayD(const PFArrayD& pfaObject); void addElement(double element); //Precondition: The array is not full //Postcondition: The element has been added bool full( ) const { return (capacity == used); } //Returns true if the array is full, false otherwise int getCapacity( ) const { return capacity; } int getNumberUsed( ) const { return used; } void emptyArray( ){ used = 0; } //Empties the array double& operator[](int index); //Read and change access to elements 0 through numberUsed - 1 PFArrayD& operator =(const PFArrayD& rightSide);
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~PFArrayD( ); private: Destructor double *a; //For an array of doubles int capacity; //For the size of the array int used; //For the number of array positions currently in use };
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 //These are the definitions for the member functions for the class PFArrayD //They require the following include and using directives: //#include <iostream> //using std::cout; PFArrayD::PFArrayD( ) :capacity(50), used(0) { a = new double[capacity]; } PFArrayD::PFArrayD(int size) :capacity(size), used(0) { a = new double[capacity]; } PFArrayD::PFArrayD(const PFArrayD& pfaObject) :capacity(pfaObjectgetCapacity( )), used(pfaObjectgetNumberUsed( )) { a = new double[capacity]; for (int i =0; i < used; i++) a[i] = pfaObjecta[i]; } void PFArrayD::addElement(double element) { if (used >= capacity) { cout << "Attempt to exceed capacity in PFArrayD\n"; exit(0); } a[used] = element; used++; } double& PFArrayD::operator[](int index) { if (index >= used) { cout << "Illegal index in PFArrayD\n"; exit(0); } return a[index]; }
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41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 PFArrayD& PFArrayD::operator =(const PFArrayD& rightSide) { if (capacity != rightSidecapacity) { delete [] a; Note that this also checks for the a = new double[rightSidecapacity]; case of having the same object on } capacity = rightSidecapacity; used = rightSideused; for (int i = 0; i < used; i++) a[i] = rightSidea[i]; return *this; } PFArrayD::~PFArrayD( ) { delete [] a; }
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 //Program to demonstrate the class PFArrayD #include <iostream> using std::cin; using std::cout; using std::endl; class PFArrayD {
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<The rest of the class definition is the same as in Display 1010> In Section 111 of 11 we show you how to divide this long file into three shorter files corresponding roughly to void testPFArrayD( ); Displays 1010, 1011, and this //Conducts one test of the class PFArrayD display without the code from Displays 1010 and 1011 int main( )
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}; { cout << "This program tests the class PFArrayD\n";
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15 16 17 18 19 20 21 char ans; do { testPFArrayD( ); cout << "Test again (y/n) "; cin >> ans; }while ((ans == y ) || (ans == Y ));
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return 0; }
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<The definitions of the member functions for the class PFArrayD go here>
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void testPFArrayD( ) { int cap; cout << "Enter capacity of this super array: "; cin >> cap; PFArrayD temp(cap);
cout << "Enter up to " << cap << " nonnegative numbers\n"; cout << "Place a negative number at the end\n";
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double next; cin >> next; while ((next >= 0) && (!tempfull( ))) { tempaddElement(next); cin >> next; }
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cout << "You entered the following " << tempgetNumberUsed( ) << " numbers:\n"; int index; int count = tempgetNumberUsed( ); for (index = 0; index < count; index++) cout << temp[index] << " "; cout << endl; cout << "(plus a sentinel value)\n"; }