View Compilation Error

0_0_4114323_15535.cpp: In function `int main(int, char**)':
0_0_4114323_15535.cpp:11: error: `scanf' undeclared (first use this function)
0_0_4114323_15535.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4114323_15535.cpp:14: error: `getchar' undeclared (first use this function)
0_0_4114323_15535.cpp:19: error: `printf' undeclared (first use this function)