opmat.cpp: In function `int search(int)': opmat.cpp:24: warning: control reaches end of non-void function opmat.cpp: In function `int search2(int)': opmat.cpp:27: warning: unused variable `int y' opmat.cpp:33: warning: control reaches end of non-void function opmat.cpp: In function `int swap(int, int)': opmat.cpp:45: warning: control reaches end of non-void function opmat.cpp: In function `int swap2(int, int)': opmat.cpp:57: warning: control reaches end of non-void function