View Compilation Error

289806_0_29897.cpp: In function `int main()':
289806_0_29897.cpp:9: error: `strlen' undeclared (first use this function)
289806_0_29897.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
289806_0_29897.cpp:49: error: `strcmp' undeclared (first use this function)