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有以下程序: #include<iostream> usingnamespacestd; classsample { private: intX; public: sample(inta) { X=a: } frienddoublesquare(samples); }; doublesquare(samples) { returnS.x*S.X: } intmain() { samples1(20),s2(30); cout<<square(s2)<<endl; return0; } 执行结果是( )。

A.20

B.30

C.900

D.400


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更多 “ 有以下程序: #includeiostream usingnamespacestd; classsample { private: intX; public: sample(inta) { X=a: } frienddoublesquare(samples); }; doublesquare(samples) { returnS.x*S.X: } intmain() { samples1(20),s2(30); coutsquare(s2)endl; return0; } 执行结果是( )。A.20B.30C.900D.400 ” 相关考题
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