View Compilation Error

0_0_11603439_726.cpp: In function `int main()':
0_0_11603439_726.cpp:15: error: `scanf' undeclared (first use this function)
0_0_11603439_726.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11603439_726.cpp:16: error: `init' undeclared (first use this function)
0_0_11603439_726.cpp:22: error: `sort' undeclared (first use this function)
0_0_11603439_726.cpp:35: error: `printf' undeclared (first use this function)