View Compilation Error

0_0_7943067_27726.cpp: In function `int main()':
0_0_7943067_27726.cpp:3: error: `scanf' undeclared (first use this function)
0_0_7943067_27726.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7943067_27726.cpp:14: error: `printf' undeclared (first use this function)
0_0_7943067_27726.cpp:25: error: `log' undeclared (first use this function)
0_0_7943067_27726.cpp:25: error: `func' undeclared (first use this function)