View Compilation Error

0_0_13440402_8037.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_13440402_8037.cpp:2:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_13440402_8037.cpp: In function 'int main()':
0_0_13440402_8037.cpp:4:14: error: 'scanf' was not declared in this scope
 scanf("%d",&n);
              ^
0_0_13440402_8037.cpp:7:15: error: 'sqrt' was not declared in this scope
 on=(int)sqrt(a);
               ^
0_0_13440402_8037.cpp:8:17: error: 'printf' was not declared in this scope
 printf("%d\n",on);
                 ^
0_0_13440402_8037.cpp:10:1: error: 'return0' was not declared in this scope
 return0;
 ^