View Compilation Error

0_0_37075823_26766.cpp: In function 'int main()':
0_0_37075823_26766.cpp:6:6: error: '_int64' was not declared in this scope
      _int64 a[10000]={0}; 
      ^
0_0_37075823_26766.cpp:8:6: error: 'a' was not declared in this scope
      a[1]=1;
      ^
0_0_37075823_26766.cpp:13:16: error: 'a' was not declared in this scope
  printf("%d\n",a[n]);
                ^