View Compilation Error

0_0_18486146_23308.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_18486146_23308.cpp:3:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_18486146_23308.cpp:5:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_18486146_23308.cpp: In function 'int main()':
0_0_18486146_23308.cpp:12:24: error: 'scanf' was not declared in this scope
     int t;scanf("%d",&t);
                        ^
0_0_18486146_23308.cpp:16:9: error: 'cout' was not declared in this scope
         cout<<a[n]<<endl;
         ^
0_0_18486146_23308.cpp:16:21: error: 'endl' was not declared in this scope
         cout<<a[n]<<endl;
                     ^