View Compilation Error

0_0_1876025_20880.cpp: In function `int main(int, char**)':
0_0_1876025_20880.cpp:7: error: `scanf' undeclared (first use this function)
0_0_1876025_20880.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1876025_20880.cpp:42: error: `printf' undeclared (first use this function)