运行程序,写出程序执行的结果。 #inCluDE<iostrEAm.h> ClAss tEst privAtE: stAtiC int vAl; int A; puBliC: stAtiC int FunC(); stAtiC voiD sFunC(tEst &r); ; int tEst::vAl=20: int tEst::FunC() vAl--; rEturn vAl; voiD tEst::sFunC(tEst &r) r.A=25; Cout<<"rEsult3="<<r.A<<EnDl; voiD mAin() Cout<<"rEsuh1="<<tEst::FunC()<<EnDl; tEst A; Cout<<"rEsult2="<<A、FunC()<<EnDl; tEst::sFunC(A);