View Compilation Error

0_0_32444508_24075.cpp: In function 'int judge(Num*, char*, char*, int)':
0_0_32444508_24075.cpp:15:18: error: 'strlen' was not declared in this scope
  if ((strlen(ming)-strlen(xi))>1) 
                  ^
0_0_32444508_24075.cpp:17:31: error: 'strlen' was not declared in this scope
  for (i = 0,k=0; i < strlen(xi); i++,k++)
                               ^
0_0_32444508_24075.cpp: In function 'int main()':
0_0_32444508_24075.cpp:53:30: error: 'memset' was not declared in this scope
   memset(&num, 0, sizeof(num));
                              ^