After having seen the()and samples, Jenny makes the specific inquiry.A、 categoryB、 catalogueC、 calculation
After having seen the()and samples, Jenny makes the specific inquiry.
A、 category
B、 catalogue
C、 calculation
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写出以下程序的执行结果 #include＜iostream.h＞ class Sample { int n; public: Sample（int i){n=i;} friend int add（Sample s1,Sample s2); }; int add（Sample s1,Sample s2){return s1.n+s2.n;} void main（) { Sample s1（10),s2（20); cout＜＜add（s1,s2)＜＜endl; }