有如下程序: #inCluDE<iostrEAm> using nAmEspACE stD; ClAss tEst puBliC: tEst() n+=2; ~tEst() n-=3; stAtiC int gEtnum()rEturn n; privAtE: stAtiC int n; ; int tEst::n=1; int mAin() tEst*p=nEw tEst; DElEtE p; Cout<<"n="<<tEst::gEtnum()<<EnDl; rEturn 0; 执行后的输出结果是()。