View Compilation Error

0_0_30288933_18837.cpp: In function 'int main()':
0_0_30288933_18837.cpp:5:2: error: '__int' was not declared in this scope
  __int num;
  ^
0_0_30288933_18837.cpp:7:13: error: 'num' was not declared in this scope
  while(cin>>num&&num!=0)
             ^