View Compilation Error

0_0_37593030_7056.cpp: In function 'bool if_num(int)':
0_0_37593030_7056.cpp:5:23: error: 'pow' was not declared in this scope
  return(pow(i / 100, 3) + pow(i % 10, 3) + pow((i % 100 - i % 10) / 10, 3) == i);
                       ^