View Compilation Error

0_0_32824106_32097.cpp: In function 'int main()':
0_0_32824106_32097.cpp:43:9: error: 'cout' was not declared in this scope
 if(nn>0)cout<<endl;
         ^
0_0_32824106_32097.cpp:43:15: error: 'endl' was not declared in this scope
 if(nn>0)cout<<endl;
               ^