View Compilation Error

599350_0_0_11128.cpp: In function `int main(int, char**)':
599350_0_0_11128.cpp:25: error: `scanf' undeclared (first use this function)
599350_0_0_11128.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)
599350_0_0_11128.cpp:39: error: `getchar' undeclared (first use this function)
599350_0_0_11128.cpp:42: error: `gets' undeclared (first use this function)
599350_0_0_11128.cpp:92: error: `printf' undeclared (first use this function)