View Compilation Error

0_0_23264962_20508.cpp: In function 'int main()':
0_0_23264962_20508.cpp:4:2: error: '_int64' was not declared in this scope
  _int64 x[51]={0,1};
  ^
0_0_23264962_20508.cpp:7:3: error: 'x' was not declared in this scope
   x[y]=x[y-1]+x[y-2];
   ^
0_0_23264962_20508.cpp:9:3: error: expected ')' before 'printf'
   printf("%I64d\n",x[y]);
   ^
0_0_23264962_20508.cpp:9:20: error: 'x' was not declared in this scope
   printf("%I64d\n",x[y]);
                    ^