View Compilation Error

0_0_27947298_10950.cpp: In function 'int main()':
0_0_27947298_10950.cpp:4:2: error: '_int64' was not declared in this scope
  _int64 a[55];
  ^
0_0_27947298_10950.cpp:6:2: error: 'a' was not declared in this scope
  a[0]=0;
  ^