View Compilation Error

0_0_19785622_13271.cpp: In function 'int main()':
0_0_19785622_13271.cpp:6:2: error: '_int64' was not declared in this scope
  _int64 num[101]={1,1,2};
  ^
0_0_19785622_13271.cpp:8:3: error: 'num' was not declared in this scope
   num[i] = num[i-1] + num[i-2];
   ^
0_0_19785622_13271.cpp:13:21: error: 'num' was not declared in this scope
   printf("%I64d\n", num[b-a]);
                     ^