View Compilation Error

0_0_3278133_4755.cpp: In function `int main()':
0_0_3278133_4755.cpp:32: error: `strdup' undeclared (first use this function)
0_0_3278133_4755.cpp:32: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3278133_4755.cpp:33: error: `strrev' undeclared (first use this function)