View Compilation Error

1_291_1655_12394.cpp: In function `int main()':
1_291_1655_12394.cpp:13: error: `scanf' undeclared (first use this function)
1_291_1655_12394.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
1_291_1655_12394.cpp:45: error: `printf' undeclared (first use this function)