View Compilation Error

0_0_30486514_28107.cpp: In function 'int main()':
0_0_30486514_28107.cpp:3:8: error: expected primary-expression before 'int'
  while(int a, std::cin>>a && a != -1)
        ^
0_0_30486514_28107.cpp:3:8: error: expected ')' before 'int'
0_0_30486514_28107.cpp:3:23: error: qualified-id in declaration before '>>' token
  while(int a, std::cin>>a && a != -1)
                       ^