The istream operator here is being overloaded and im not sure what the TODO mean

Question

The istream operator here is being overloaded and im not sure what the TODO mean. I looked up what peek does but i dont know how to use it in this situation. Please help

// TODO: Make this read integer values if no '/' is given as a separator.
// You may assume that there is no space between the numerator and the
// slash. Hint, find and read the reference documentation for istream::peek().
std::istream&
operator>>(std::istream& is, Rational& r)
{
int p, q;
char c;
is >> p >> c >> q;
if (!is)
return is;

// Require that the divider to be a '/'.
if (c != '/') {
is.setstate(std::ios::failbit);
return is;
}

// Make sure that we didn't read p/0.
if (q == 0) {
is.setstate(std::ios::failbit);
return is;
}

r = Rational(p, q);
return is;
}

Explanation / Answer

std::istream& inp(std::istream& is, Rational& r)
{
if (!is)
return is;
int p, q;
char c;
is >> p;
  
c = is.peek(); // peek character
if ( c == '/' )
{
cin >> c >> q;
if (q == 0) {
is.setstate(std::ios::failbit);
return is;
}
}
else
{
c = '/';
q = 1;
}
cout << p <<c <<q << endl;
r = Rational(p, q);
return is;
}

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