View Compilation Error

0_0_14953334_12105.cpp: In function 'int main()':
0_0_14953334_12105.cpp:53:36: error: 'quickpow' was not declared in this scope
                     y+=quickpow(2,i);
                                    ^
0_0_14953334_12105.cpp:64:38: error: 'quickpow' was not declared in this scope
                       y+=quickpow(2,i);
                                      ^