View Compilation Error

0_0_10164970_19094.cpp: In function `int main()':
0_0_10164970_19094.cpp:27: error: `memset' undeclared (first use this function)
0_0_10164970_19094.cpp:27: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10164970_19094.cpp:31: error: `strlen' undeclared (first use this function)