View Compilation Error

0_0_27751069_30730.cpp: In function 'int main()':
0_0_27751069_30730.cpp:10:2: error: 'longlong' was not declared in this scope
  longlong  a,b;
  ^
0_0_27751069_30730.cpp:11:7: error: 'a' was not declared in this scope
  cin>>a>>b;
       ^
0_0_27751069_30730.cpp:11:10: error: 'b' was not declared in this scope
  cin>>a>>b;
          ^