View Compilation Error

0_0_2532989_14627.cpp: In function `int main()':
0_0_2532989_14627.cpp:23: error: `scanf' undeclared (first use this function)
0_0_2532989_14627.cpp:23: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2532989_14627.cpp:23: error: `EOF' undeclared (first use this function)
0_0_2532989_14627.cpp:24: error: `memset' undeclared (first use this function)
0_0_2532989_14627.cpp:28: error: `printf' undeclared (first use this function)