View Compilation Error

0_0_4114298_23233.cpp: In function `int main(int, char**)':
0_0_4114298_23233.cpp:9: error: `scanf' undeclared (first use this function)
0_0_4114298_23233.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4114298_23233.cpp:12: error: `getchar' undeclared (first use this function)
0_0_4114298_23233.cpp:17: error: `printf' undeclared (first use this function)