In file included from main.cpp:8:0:
num.cpp: In member function 'Num& Num::operator+=(int)':
num.cpp:55:26: error: '__int64' does not name a type; did you mean '__rintf64'?
     value = (static_cast<__int64>(value) + num) % modulo;
                          ^~~~~~~
                          __rintf64
num.cpp: In member function 'Num& Num::operator*=(int)':
num.cpp:66:5: error: '__int64' was not declared in this scope
     __int64 VAL = value;
     ^~~~~~~
num.cpp:66:5: note: suggested alternative: '__rintf64'
     __int64 VAL = value;
     ^~~~~~~
     __rintf64
num.cpp:67:26: error: '__int64' does not name a type; did you mean '__rintf64'?
     value = (static_cast<__int64>(value) * num) % modulo;
                          ^~~~~~~
                          __rintf64