程序填空。以下程序输出结果为：s=7请把程序补充完整#includeusing namespace std；class Sample {private： int a; static int s; public: Sample(int n){a=n; s+=a;} static void func(Sample s); }; void Sample::func( ) { cout<<"s="<答案不要再重复写分号啦void main() { Sample s1(2),s2(5); ___（2）__ ；//答案不要再重复写分号啦}