#include\x20
#include\x20
#include\x20
#include\x20
using\x20namespace\x20std;
struct\x20Record\x20{
\x20\x20string\x20name;
\x20\x20int\x20age;
\x20\x20string\x20address;
};
class\x20Database\x20{
private:
\x20\x20vector\x20records;
\x20\x20string\x20filename;
\x20\x20
\x20\x20void\x20saveToFile()\x20{
\x20\x20\x20\x20ofstream\x20file(filename);
\x20\x20\x20\x20if\x20(file.is_open())\x20{
\x20\x20\x20\x20\x20\x20for\x20(const\x20auto&\x20record\x20:\x20records)\x20{
\x20\x20\x20\x20\x20\x20\x20\x20file\x20<<\x20record.name\x20<<\x20","\x20<<\x20record.age\x20<<\x20","\x20<<\x20record.address\x20<<\x20endl;
\x20\x20\x20\x20\x20\x20}
\x20\x20\x20\x20\x20\x20file.close();
\x20\x20\x20\x20\x20\x20cout\x20<<\x20"Database\x20saved\x20to\x20file.\n";
\x20\x20\x20\x20}else\x20{
\x20\x20\x20\x20\x20\x20cout\x20<<\x20"Error\x20opening\x20file.\n";
\x20\x20\x20\x20}
\x20\x20}
\x20\x20
\x20\x20void\x20loadFromFile()\x20{
\x20\x20\x20\x20ifstream\x20file(filename);
\x20\x20\x20\x20if\x20(file.is_open())\x20{
\x20\x20\x20\x20\x20\x20string\x20line;
\x20\x20\x20\x20\x20\x20while\x20(getline(file,\x20line))\x20{
\x20\x20\x20\x20\x20\x20\x20\x20Record\x20record;
\x20\x20\x20\x20\x20\x20\x20\x20size_t\x20commaIndex\x20=\x20line.find(",");
\x20\x20\x20\x20\x20\x20\x20\x20record.name\x20=\x20line.substr(0,\x20commaIndex);
\x20\x20\x20\x20\x20\x20\x20\x20line\x20=\x20line.substr(commaIndex\x20+\x201);
\x20\x20\x20\x20\x20\x20\x20\x20
\x20\x20\x20\x20\x20\x20\x20\x20commaIndex\x20=\x20line.find(",");
\x20\x20\x20\x20\x20\x20\x20\x20record.age\x20=\x20stoi(line.substr(0,\x20commaIndex));
\x20\x20\x20\x20\x20\x20\x20\x20line\x20=\x20line.substr(commaIndex\x20+\x201);
\x20\x20\x20\x20\x20\x20\x20\x20
\x20\x20\x20\x20\x20\x20\x20\x20record.address\x20=\x20line;
\x20\x20\x20\x20\x20\x20\x20\x20records.push_back(record);
\x20\x20\x20\x20\x20\x20}
\x20\x20\x20\x20\x20\x20file.close();
\x20\x20\x20\x20\x20\x20cout\x20<<\x20"Database\x20loaded\x20from\x20file.\n";
\x20\x20\x20\x20}else\x20{
\x20\x20\x20\x20\x20\x20cout\x20<<\x20"Error\x20opening\x20file.\n";
\x20\x20\x20\x20}
\x20\x20}
\x20\x20
public:
\x20\x20Database(const\x20string&\x20filename)\x20:\x20filename(filename)\x20{
\x20\x20\x20\x20loadFromFile();
\x20\x20}
\x20\x20
\x20\x20void\x20addRecord(const\x20Record&\x20record)\x20{
\x20\x20\x20\x20records.push_back(record);
\x20\x20\x20\x20saveToFile();
\x20\x20}
\x20\x20
\x20\x20void\x20printRecords()\x20const\x20{
\x20\x20\x20\x20for\x20(const\x20auto&\x20record\x20:\x20records)\x20{
\x20\x20\x20\x20\x20\x20cout\x20<<\x20"Name:\x20"\x20<<\x20record.name\x20<<\x20",\x20Age:\x20"\x20<<\x20record.age\x20<<\x20",\x20Address:\x20"\x20<<\x20record.address\x20<<\x20endl;
\x20\x20\x20\x20}
\x20\x20}
};
int\x20main()\x20{
\x20\x20Database\x20db("data.txt");
\x20\x20
\x20\x20Record\x20record1;
\x20\x20record1.name\x20=\x20"John";
\x20\x20record1.age\x20=\x2025;
\x20\x20record1.address\x20=\x20"123\x20Main\x20St";
\x20\x20db.addRecord(record1);
\x20\x20
\x20\x20Record\x20record2;
\x20\x20record2.name\x20=\x20"Amy";
\x20\x20record2.age\x20=\x2030;
\x20\x20record2.address\x20=\x20"456\x20Elm\x20St";
\x20\x20db.addRecord(record2);
\x20\x20
\x20\x20db.printRecords();
\x20\x20
\x20\x20return\x200;
