View Compilation Error

0_0_15825233_28456.cpp: In function 'int main()':
0_0_15825233_28456.cpp:5:2: error: '_int64' was not declared in this scope
  _int64 f[55]={0,1,1};
  ^
0_0_15825233_28456.cpp:6:19: error: 'f' was not declared in this scope
  for(i=3;i<55;i++)f[i]=f[i-1]+f[i-2];
                   ^
0_0_15825233_28456.cpp:11:26: error: 'f' was not declared in this scope
         printf("%I64d\n",f[b-a+1]);
                          ^