View Compilation Error

0_0_5576253_9221.cpp: In function `void change(char*, char*, int)':
0_0_5576253_9221.cpp:33: error: `strrev' undeclared (first use this function)
0_0_5576253_9221.cpp:33: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5576253_9221.cpp: In function `int main()':
0_0_5576253_9221.cpp:102: error: `strrev' undeclared (first use this function)