In file included from main.cpp:8:0:
num.cpp: In member function 'Num& Num::operator*=(int)':
num.cpp:67:5: error: '__int64' was not declared in this scope
     __int64 lvalue, rvalue;
     ^~~~~~~
num.cpp:67:5: note: suggested alternative: '__int64_t'
     __int64 lvalue, rvalue;
     ^~~~~~~
     __int64_t
num.cpp:68:5: error: 'lvalue' was not declared in this scope
     lvalue = value;
     ^~~~~~
num.cpp:68:5: note: suggested alternative: 'value'
     lvalue = value;
     ^~~~~~
     value
num.cpp:69:5: error: 'rvalue' was not declared in this scope
     rvalue = num;
     ^~~~~~
num.cpp:69:5: note: suggested alternative: 'value'
     rvalue = num;
     ^~~~~~
     value