View Compilation Error

0_0_23923093_862.c: In function 'judge':
0_0_23923093_862.c:8:28: error: 'false' undeclared (first use in this function)
  if(strlen(s) > 10) return false;
                            ^
0_0_23923093_862.c:8:28: note: each undeclared identifier is reported only once for each function it appears in
0_0_23923093_862.c:10:43: error: 'true' undeclared (first use in this function)
  if(strlen(s) == 1 && s[0] == '0') return true;
                                           ^