How do I complete my code using an external file?

External file: data.txt

//the number 6 is in the external file

Incomplete code:

#include #include

using namespace std;

class example { int data[1];

public:

example();

void read(ifstream &);

};

example::example() { ifstream infile; infile.open("data.txt"); }

void example::read(ifstream &infile) { infile >> data[1]; cout << data[1] << endl; }

int main() { example example, read;

//system("pause"); return 0; }