View Compilation Error

0_0_8770431_21514.cpp:3:35: '#' is not followed by a macro parameter
0_0_8770431_21514.cpp: In function `int main()':
0_0_8770431_21514.cpp:22: error: `qsort' undeclared (first use this function)
0_0_8770431_21514.cpp:22: error: (Each undeclared identifier is reported only once for each function it appears in.)