View Compilation Error

0_0_8704495_8468.cpp: In function `int main()':
0_0_8704495_8468.cpp:10: error: `scanf' undeclared (first use this function)
0_0_8704495_8468.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8704495_8468.cpp:12: error: `putchar' undeclared (first use this function)
0_0_8704495_8468.cpp:14: error: `getchar' undeclared (first use this function)