执行以下程序,输出结果的最后一行语句是______。 include <iostream.h> class Sample { int x,y; public: Sample(){x=y=0;} Sample(int a,int b){x=a;y=b;} ~Sample() { if(x==y) cout<<'x!=y'<<end1; else cout<<'x!=y'<<end1; } void disp() { cout<<'x='<<x<<',y='<<y<<end1; } }; void main() { Sample s1(2,3); s1.disp(); }