View Compilation Error

2_24386_1783893_22811.cpp: In function `int main()':
2_24386_1783893_22811.cpp:45: error: `scanf' undeclared (first use this function)
2_24386_1783893_22811.cpp:45: error: (Each undeclared identifier is reported only once for each function it appears in.)
2_24386_1783893_22811.cpp:64: error: `printf' undeclared (first use this function)