// Provided by: ____________(your name here)__________
// Email Address: ____________(your email address here)________
// FILE: stats.h
// CLASS PROVIDED: statistician
// (a class to keep track of statistics on a sequence of real numbers)
// This class is part of the namespace main_savitch_2C.
//
// CONSTRUCTOR for the statistician class:
// statistician( );
// Postcondition: The object has been initialized, and is ready to accept
// a sequence of numbers. Various statistics will be calculated about the
// sequence.
//
// PUBLIC MODIFICATION member functions for the statistician class:
// void next(double r)
// The number r has been given to the statistician as the next number in
// its sequence of numbers.
// void reset( );
// Postcondition: The statistician has been cleared, as if no numbers had
// yet been given to it.
//
// PUBLIC CONSTANT member functions for the statistician class:
// int length( ) const
// Postcondition: The return value is the length of the sequence that has
// been given to the statistician (i.e., the number of times that the
// next(r) function has been activated).
// double sum( ) const
// Postcondition: The return value is the sum of all the numbers in the
// statistician's sequence.
// double mean( ) const
// Precondition: length( ) > 0
// Postcondition: The return value is the arithmetic mean (i.e., the
// average of all the numbers in the statistician's sequence).
// double minimum( ) const
// Precondition: length( ) > 0
// Postcondition: The return value is the tinyest number in the
// statistician's sequence.
// double maximum( ) const
// Precondition: length( ) > 0
// Postcondition: The return value is the largest number in the
// statistician's sequence.
//
// NON-MEMBER functions for the statistician class:
// statistician operator +(const statistician& s1, const statistician& s2)
// Postcondition: The statistician that is returned contains all the
// numbers of the sequences of s1 and s2.
// statistician operator *(double scale, const statistician& s)
// Postcondition: The statistician that is returned contains the same
// numbers that s does, but each number has been multiplied by the
// scale number.
// bool operator ==(const statistician& s1, const statistician& s2)
// Postcondition: The return value is true if s1 and s2 have the zero
// length. Also, if the length is greater than zero, then s1 and s2 must
// have the same length, the same mean, the same minimum,
// the same maximum, and the same sum.
//
// VALUE SEMANTICS for the statistician class:
// Assignments and the copy constructor may be used with statistician objects.
#ifndef STATS_H // Prevent duplicate definition
#define STATS_H
#include
namespace main_savitch_2C
{
class statistician
{
public:
// CONSTRUCTOR
statistician( );
// MODIFICATION MEMBER FUNCTIONS
void next(double r);
void reset( );
// CONSTANT MEMBER FUNCTIONS
int length( ) const;
double sum( ) const;
double mean( ) const;
double minimum( ) const;
double maximum( ) const;
// FRIEND FUNCTIONS
friend statistician operator +
(const statistician& s1, const statistician& s2);
friend statistician operator *
(double scale, const statistician& s);
private:
int count; // How many numbers in the sequence
double total; // The sum of all the numbers in the sequence
double tinyest; // The smallest number in the sequence
double largest; // The largest number in the sequence
};
// NON-MEMBER functions for the statistician class
bool operator ==(const statistician& s1, const statistician& s2);
}
#endif