View Compilation Error

0_0_8882394_10823.cpp: In function `int main()':
0_0_8882394_10823.cpp:26: error: `memset' undeclared (first use this function)
0_0_8882394_10823.cpp:26: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8882394_10823.cpp:30: error: `system' undeclared (first use this function)