Update ex6_22.cpp
Update ex6_22.cpp

pezy/CppPrimer,akanezorap/CppPrimer,shuidong/CppPrimer,heamon7/CppPrimer,Milk-SF/CppPrimer,zhangzhizhongz3/CppPrimer,laohei889/CppPrimer,lawlietye/CppPrimer,Sublele/CppPrimer,akanezorap/CppPrimer,wgs111/CppPrimer,shuidong/CppPrimer,cseryp/CppPrimer,floristt/CppPrimer,jwave/CppPrimer,lawlietye/CppPrimer,pezy/CppPrimer,Milk-SF/CppPrimer,zhangzhizhongz3/CppPrimer,m0000re/CppPrimer,vzyw/CppPrimer,cheng668/CppPrimer,laohei889/CppPrimer,Sublele/CppPrimer,heamon7/CppPrimer,FingerSport/CppPrimer,vzyw/CppPrimer,cseryp/CppPrimer,wgs111/CppPrimer,cheng668/CppPrimer,at86/CppPrimer,sheldon66/CppPrimer,sheldon66/CppPrimer,at86/CppPrimer,jwave/CppPrimer,FingerSport/CppPrimer,floristt/CppPrimer,m0000re/CppPrimer