View Compilation Error

0_0_8785533_7394.cpp: In function `int main()':
0_0_8785533_7394.cpp:10: error: `scanf' undeclared (first use this function)
0_0_8785533_7394.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8785533_7394.cpp:18: error: `sort' undeclared (first use this function)
0_0_8785533_7394.cpp:19: error: `printf' undeclared (first use this function)