View Compilation Error

0_0_38216850_952.cpp: In function 'int main()':
0_0_38216850_952.cpp:21:17: error: 'cout' was not declared in this scope
     if(c=='\n') cout<<s<<endl,s="";
                 ^
0_0_38216850_952.cpp:21:26: error: 'endl' was not declared in this scope
     if(c=='\n') cout<<s<<endl,s="";
                          ^