View Compilation Error

0_0_26342647_14156.cpp: In function 'void p(long long int, long long int)':
0_0_26342647_14156.cpp:7:36: error: 'memset' was not declared in this scope
  for (i = 0, memset(a, 0, sizeof(a)); x > 9; x = x / 10, i++)
                                    ^
0_0_26342647_14156.cpp:11:36: error: 'memset' was not declared in this scope
  for (i = 0, memset(b, 0, sizeof(b)); y > 9; y = y / 10, i++)
                                    ^