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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_300
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353_02
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multinh1.cpp
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C/C++ Source or Header
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1992-01-19
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// Chapter 9 - Program 1
#include <iostream.h>
class moving_van {
protected:
float payload;
float gross_weight;
float mpg;
public:
void initialize(float pl, float gw, float in_mpg) {
payload = pl;
gross_weight = gw;
mpg = in_mpg; };
float efficiency(void) {
return(payload / (payload + gross_weight)); };
float cost_per_ton(float fuel_cost) {
return(fuel_cost / (payload / 2000.0)); };
};
class driver {
protected:
float hourly_pay;
public:
void initialize(float pay) {hourly_pay = pay; };
float cost_per_mile(void) {return(hourly_pay / 55.0); } ;
};
class driven_truck : public moving_van, public driver {
public:
void initialize_all(float pl, float gw, float in_mpg, float pay)
{ payload = pl;
gross_weight = gw;
mpg = in_mpg;
hourly_pay = pay; };
float cost_per_full_day(float cost_of_gas) {
return(8.0 * hourly_pay +
8.0 * cost_of_gas * 55.0 / mpg); };
};
main()
{
driven_truck chuck_ford;
chuck_ford.initialize_all(20000.0, 12000.0, 5.2, 12.50);
cout << "The efficiency of the Ford is " <<
chuck_ford.efficiency() << "\n";
cout << "The cost per mile for Chuck to drive is " <<
chuck_ford.cost_per_mile() << "\n";
cout << "The cost of Chuck driving the Ford for a day is " <<
chuck_ford.cost_per_full_day(1.129) << "\n";
}
// Result of execution
//
// The efficiency of the Ford is .625
// The cost per mile for Chuck to drive is 0.227273
// The cost of Chuck driving the Ford for a day is 195.530762