View Compilation Error

0_0_12049804_25264.cpp: In function `int main()':
0_0_12049804_25264.cpp:8: error: `scanf' undeclared (first use this function)
0_0_12049804_25264.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12049804_25264.cpp:20: error: `printf' undeclared (first use this function)