#include <iosfwd>
struct Fraction
{
int numerator;
int denominator;
};
std::ostream& operator<<(std::ostream&, const Fraction&);
#include <iostream>
std::ostream& operator<<(std::ostream& os, const Fraction & f)
{
return os << f.numerator << " / " << f.denominator ;
}
int main()
{
std::cout << Fraction{ 5, 9} << '\n' ;
}
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