View Compilation Error

0_0_30087510_15445.cpp: In function 'int poly(int)':
0_0_30087510_15445.cpp:14:36: error: 'ploy' was not declared in this scope
             while(k--) temp=ploy(id);
                                    ^
0_0_30087510_15445.cpp: In function 'int main()':
0_0_30087510_15445.cpp:30:15: error: 'ploy' was not declared in this scope
         ploy(0);
               ^