In file included from main.cpp:8:0:
num.cpp: In member function 'Num& Num::operator+=(int)':
num.cpp:55:5: error: '__int64' was not declared in this scope
     __int64 VAL = value;
     ^~~~~~~
num.cpp:55:5: note: suggested alternative: '__rintf64'
     __int64 VAL = value;
     ^~~~~~~
     __rintf64
num.cpp:56:14: error: 'VAL' was not declared in this scope
     value = (VAL + num) % modulo;
              ^~~
num.cpp: In member function 'Num& Num::operator*=(int)':
num.cpp:67:5: error: '__int64' was not declared in this scope
     __int64 VAL = value;
     ^~~~~~~
num.cpp:67:5: note: suggested alternative: '__rintf64'
     __int64 VAL = value;
     ^~~~~~~
     __rintf64
num.cpp:68:14: error: 'VAL' was not declared in this scope
     value = (VAL * num) % modulo;
              ^~~