View Compilation Error

0_0_13010378_9821.cpp:1:10: #include expects "FILENAME" or <FILENAME>
0_0_13010378_9821.cpp: In function `int find(int)':
0_0_13010378_9821.cpp:4: error: `pre' undeclared (first use this function)
0_0_13010378_9821.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_13010378_9821.cpp: In function `int main()':
0_0_13010378_9821.cpp:15: error: `scanf' undeclared (first use this function)
0_0_13010378_9821.cpp:18: error: `pre' undeclared (first use this function)
0_0_13010378_9821.cpp:30: error: `printf' undeclared (first use this function)
0_0_13010378_9821.cpp: At global scope:
0_0_13010378_9821.cpp:30: error: expected unqualified-id before "return"
0_0_13010378_9821.cpp:30: error: expected `,' or `;' before "return"
0_0_13010378_9821.cpp:31: error: expected declaration before '}' token