View Compilation Error

0_0_8969492_12711.cpp:1:9: #include expects "FILENAME" or <FILENAME>
0_0_8969492_12711.cpp:2:9: #include expects "FILENAME" or <FILENAME>
0_0_8969492_12711.cpp:3:9: #include expects "FILENAME" or <FILENAME>
0_0_8969492_12711.cpp: In function `int main()':
0_0_8969492_12711.cpp:27: error: `scanf' undeclared (first use this function)
0_0_8969492_12711.cpp:27: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8969492_12711.cpp:30: error: `memset' undeclared (first use this function)
0_0_8969492_12711.cpp:36: error: `printf' undeclared (first use this function)