Необходимо Дописать программу:
- добавить мембер функцию get_last, которая takes no arguments и возврашает последнее число в списке (не должна вызываться если список пуст).
- добавить мембер функцию delete_last (void), которая удаляет последнее число в списке (размер списка не обходимо модифицировать- уменшить).
- определить класс List, который will make no reference to temperatures when it outputs values.
| C++ |
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| #include <iostream>
#include <cstdlib>
using namespace std;
const int MAX_LIST_SIZE = 50;
class TemperatureList
{
public:
TemperatureList( );
//Initializes the object to an empty list.
int get_size() const;
void add_temperature(double temperature);
//Precondition: The list is not full.
//Postcondition: The temperature has been added to the list.
double get_temperature(int position) const;
bool full( ) const;
//Returns true if the list is full; false otherwise.
friend ostream& operator <<(ostream& outs,
const TemperatureList& the_object);
//Overloads the << operator so it can be used to output values of
//type TemperatureList. Temperatures are output one per line.
//Precondition: If outs is a file output stream, then outs
//has already been connected to a file.
private:
double list[MAX_LIST_SIZE]; //of temperatures in Fahrenheit
int size; //number of array positions filled
};
//This is the implementation for the class TemperatureList.
TemperatureList::TemperatureList( ) : size(0)
{
//Body intentionally empty.
}
void TemperatureList::add_temperature(double temperature)
{//Uses iostream and cstdlib:
if ( full( ) )
{
cout << "Error: adding to a full list.\n";
exit(1);
}
else
{
list[size] = temperature;
size = size + 1;
}
}
bool TemperatureList::full( ) const
{
return (size == MAX_LIST_SIZE);
}
//Uses iostream:
ostream& operator <<(ostream& outs, const TemperatureList& the_object)
{
for (int i = 0; i < the_object.size; i++)
outs << the_object.list[i] << " F\n";
return outs;
}
int TemperatureList::get_size() const
{
return size;
}
double int TemperatureList::get_temperature(int position) const
{
if((position >= size) || (position < 0)
{
cout << "Error:"
<< "reading an empty list position.\n";
exit(1);
}
else
return(list[position]);
} |
|
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