View Compilation Error

1081578_0_0_838.cpp: In function `int main()':
1081578_0_0_838.cpp:14: error: `memset' undeclared (first use this function)
1081578_0_0_838.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)
1081578_0_0_838.cpp:23: error: `qsort' undeclared (first use this function)