Delete ex7_6_7.cpp
Delete ex7_6_7.cpp

divide the interface and the implementation.
AndychenCL/Cpp-Primer,at86/CppPrimer,akanezorap/CppPrimer,Allianzcortex/Cpp-Primer,seekertang/Cpp-Primer,frank67/Cpp-Primer,zhangzhizhongz3/CppPrimer,laohei889/CppPrimer,lawlietye/CppPrimer,Squawk09/Cpp-Primer,Milk-SF/CppPrimer,jwave/CppPrimer,zhangzhizhongz3/CppPrimer,suesai/Cpp-Primer,Sublele/CppPrimer,Jinpeiqi/Cpp-Primer,Squawk09/Cpp-Primer,cseryp/CppPrimer,jasonchenzhou/Cpp-Primer,coldmanck/Cpp-Primer,jasonchenzhou/Cpp-Primer,kevinzhang2012/Cpp-Primer,sanerror/Cpp-Primer,OlafLee/Cpp-Primer,AwesomePH/Cpp-Primer,AwesomePH/Cpp-Primer,clearScreenZJ/Cpp-Primer,wangqc/Cpp-Primer,heamon7/CppPrimer,heamon7/CppPrimer,suesai/Cpp-Primer,vzyw/CppPrimer,sheldon66/CppPrimer,Mooophy/Cpp-Primer,scottszb1987/Cpp-Primer-1,frank67/Cpp-Primer,MojieBuddhist/Cpp-Primer,Fenolona/Cpp-Primer,opensourceDA/Cpp-Primer,floristt/CppPrimer,sin-zx/Cpp-Primer,shuidong/CppPrimer,akanezorap/CppPrimer,zjryan/Cpp-Primer,m0000re/CppPrimer,yl2695/Cpp-Primer,evan617/Cpp-Primer,floristt/CppPrimer,cseryp/CppPrimer,Sublele/CppPrimer,anguszxd/CppPrimer,sunday1103/Cpp-Primer,andersy005/Cpp-Primer,buptfb/Cpp-Primer,zhuanggengzhen/Cpp-Primer-1,singleman/Cpp-Primer,codetiger7/Cpp-Primer,sanerror/Cpp-Primer,laohei889/CppPrimer,sheldon66/CppPrimer,kevinzhang1986/Cpp-Primer,lawlietye/CppPrimer,wy7980/Cpp-Primer,tre-pengxu/Cpp-Primer,fzls/Cpp-Primer,FingerSport/CppPrimer,XDXX/Cpp-Primer,honestme/Cpp-Primer,Nwpuer/Cpp-Primer,theneversky/Cpp-Primer,Mooophy/Cpp-Primer,Mugurell/Cpp-Primer,zhuanggengzhen/Cpp-Primer-1,XDXX/Cpp-Primer,Soyn/Cpp-Primer,coldmanck/Cpp-Primer,jiutianhuayu/Cpp-Primer,FingerSport/CppPrimer,Fenolona/Cpp-Primer,cheng668/CppPrimer,Milk-SF/CppPrimer,sunlianqiang/Cpp-Primer,jiutianhuayu/Cpp-Primer,wgs111/CppPrimer,sunlianqiang/Cpp-Primer,cheng668/CppPrimer,theneversky/Cpp-Primer,seekertang/Cpp-Primer,LiaoPan/Cpp-Primer,honestme/Cpp-Primer,pezy/CppPrimer,andersy005/Cpp-Primer,vzyw/CppPrimer,sigma-random/Cpp-Primer,pezy/CppPrimer,IBYoung/Cpp-Primer,MojieBuddhist/Cpp-Primer,ricardousp/Cpp-Primer,m0000re/CppPrimer,jieniyimiao/CppPrimer,jwave/CppPrimer,AndychenCL/Cpp-Primer,courri/Cpp-Primer,Jinpeiqi/Cpp-Primer,wgs111/CppPrimer,shuidong/CppPrimer,at86/CppPrimer,kevinzhang1986/Cpp-Primer,kevinzhang2012/Cpp-Primer,Soyn/Cpp-Primer