View Compilation Error

0_0_6390780_22349.cpp: In function `int main()':
0_0_6390780_22349.cpp:13: error: `memset' undeclared (first use this function)
0_0_6390780_22349.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6390780_22349.cpp:26: error: `cin' undeclared (first use this function)
0_0_6390780_22349.cpp:29: error: `scanf' undeclared (first use this function)
0_0_6390780_22349.cpp:54: error: `printf' undeclared (first use this function)
0_0_6390780_22349.cpp:57: error: `system' undeclared (first use this function)