View Compilation Error

0_0_38562462_1828.cpp: In function 'int main()':
0_0_38562462_1828.cpp:5:2: error: '_int64' was not declared in this scope
  _int64 fib[51]={0};
  ^
0_0_38562462_1828.cpp:6:2: error: 'fib' was not declared in this scope
  fib[0]=0;
  ^