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//Listing 14.10 Using Command-line Arguments
#include <fstream>
#include <iostream>
using namespace std;
class Animal
{
public:
Animal(int weight, long days): itsWeight(weight), DaysAlive(days){}
~Animal(){}
int GetWeight()const { return itsWeight; }
void SetWeight(int weight) { itsWeight = weight; }
long GetDaysAlive()const { return DaysAlive; }
void SetDaysAlive(long days) { DaysAlive = days; }
private:
int itsWeight;
long DaysAlive;
};
int main(int argc, char *argv[]) // returns 1 on error
{
if (argc != 2)
{
cout << "Usage: " << argv[0] << " <filename>" << endl;
return(1);
}
ofstream fout(argv[1], ios::binary);
if (!fout)
{
cout << "Unable to open " << argv[1] << " for writing.\n";
return(1);
}
Animal Bear(50,100);
fout.write(reinterpret_cast<char*>(&Bear), sizeof Bear);
fout.close();
ifstream fin(argv[1], ios::binary);
if (!fin)
{
cout << "Unable to open " << argv[1] << " for reading.\n";
return(1);
}
Animal BearTwo(1,1);
cout << "BearTwo weight: " << BearTwo.GetWeight() << endl;
cout << "BearTwo days: " << BearTwo.GetDaysAlive() << endl;
fin.read(reinterpret_cast<char*>(&BearTwo), sizeof BearTwo);
cout << "BearTwo weight: " << BearTwo.GetWeight() << endl;
cout << "BearTwo days: " << BearTwo.GetDaysAlive() << endl;
fin.close();
return 0;
}
Compiling Program...
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Text
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