View Compilation Error

0_0_14228694_17837.cpp: In function 'int main()':
0_0_14228694_17837.cpp:5:2: error: '_int64' was not declared in this scope
  _int64 b[40]={0,3,8};
  ^
0_0_14228694_17837.cpp:7:3: error: 'b' was not declared in this scope
   b[i]=2*(b[i-1]+b[i-2]);
   ^
0_0_14228694_17837.cpp:9:20: error: 'b' was not declared in this scope
   printf("%I64d\n",b[n]);
                    ^