View Compilation Error

0_0_4095440_18190.cpp: In function `int main()':
0_0_4095440_18190.cpp:3: error: `scanf' undeclared (first use this function)
0_0_4095440_18190.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4095440_18190.cpp:3: error: `EOF' undeclared (first use this function)
0_0_4095440_18190.cpp:10: error: `sqrt' undeclared (first use this function)
0_0_4095440_18190.cpp:14: error: `printf' undeclared (first use this function)