View Compilation Error

375274_0_0_28073.cpp: In function `int main()':
375274_0_0_28073.cpp:4: error: `scanf' undeclared (first use this function)
375274_0_0_28073.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
375274_0_0_28073.cpp:9: error: `x' undeclared (first use this function)
375274_0_0_28073.cpp:16: error: `printf' undeclared (first use this function)