prog.cc:51:12: warning: returning reference to local temporary object [-Wreturn-stack-address]
    return a.value;
           ^~~~~~~
prog.cc:61:12: warning: returning reference to local temporary object [-Wreturn-stack-address]
    return a.value;
           ^~~~~~~
prog.cc:66:12: warning: returning reference to local temporary object [-Wreturn-stack-address]
    return Fraction(-a.value);
           ^~~~~~~~~~~~~~~~~~
prog.cc:64:62: warning: unused parameter 'b' [-Wunused-parameter]
const Fraction& operator/(const Fraction& a, const Fraction& b)
                                                             ^
prog.cc:80:1: warning: all paths through this function will call itself [-Winfinite-recursion]
{
^
prog.cc:85:1: warning: all paths through this function will call itself [-Winfinite-recursion]
{