View Compilation Error

0_0_3332350_23166.cpp: In function `int main()':
0_0_3332350_23166.cpp:10: error: `strlen' undeclared (first use this function)
0_0_3332350_23166.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3332350_23166.cpp:14: error: `strcmp' undeclared (first use this function)