Mega Code Archive
Save and read class back and forth to a file
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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
class Person {
char name[80];
char areaCode[4];
char prefix[4];
char num[5];
public:
Person() { };
Person(char *n, char *a, char *p, char *nm)
{
strcpy(name, n);
strcpy(areaCode, a);
strcpy(prefix, p);
strcpy(num, nm);
}
friend ostream &operator<<(ostream &stream, Person o);
friend istream &operator>>(istream &stream, Person &o);
};
ostream &operator<<(ostream &stream, Person o)
{
stream << o.name << " ";
stream << "(" << o.areaCode << ") ";
stream << o.prefix << "-";
stream << o.num << endl;
return stream; // must return stream
}
istream &operator>>(istream &stream, Person &o)
{
cout << "Enter name: ";
stream >> o.name;
cout << "Enter area code: ";
stream >> o.areaCode;
cout << "Enter prefix: ";
stream >> o.prefix;
cout << "Enter number: ";
stream >> o.num;
cout << endl;
return stream;
}
int main()
{
Person personObject;
char c;
fstream pb("phone", ios::in | ios::out | ios::app);
if(!pb) {
cout << "Cannot open phone book file.\n";
return 1;
}
for(;;) {
do {
cout << "1. Enter numbers\n";
cout << "2. Display numbers\n";
cout << "3. Quit\n";
cout << "\nEnter a choice: ";
cin >> c;
} while(c < '1' || c > '3');
switch(c) {
case '1':
cin >> personObject;
cout << "Entry is: ";
cout << personObject;
pb << personObject;
break;
case '2':
char ch;
pb.seekg(0, ios::beg);
while(!pb.eof()) {
pb.get(ch);
if(!pb.eof())
cout << ch;
}
pb.clear();
cout << endl;
break;
case '3':
pb.close();
return 0;
}
}
}
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