View Compilation Error

0_0_4531653_27903.cpp: In function `void getff()':
0_0_4531653_27903.cpp:13: error: `memset' undeclared (first use this function)
0_0_4531653_27903.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4531653_27903.cpp:15: error: `strlen' undeclared (first use this function)
0_0_4531653_27903.cpp: In function `void init()':
0_0_4531653_27903.cpp:40: error: `memset' undeclared (first use this function)
0_0_4531653_27903.cpp: In function `void get_rm()':
0_0_4531653_27903.cpp:47: error: `memset' undeclared (first use this function)