View Compilation Error

0_0_15055173_31611.cpp: In function 'int main()':
0_0_15055173_31611.cpp:9:2: error: '_int64' was not declared in this scope
  _int64 a[50];//注意这里是怎么实现的，分配8字节
  ^
0_0_15055173_31611.cpp:13:33: error: 'a' was not declared in this scope
                                 a[1]=1;a[2]=2;
                                 ^