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有以下程序#include <iostream>using namespace std;class sample{private: int x;public: sample(int a) { x=a; } friend double square(sample s);};double square(sample s){ return s. x*s. x;}int main(){ sample s1(20),s2(30); cout<<square(s2)<<end1; return 0;}执行结果是( )。

单选题
2022-01-13 20:22
A、20
B、30
C、900
D、400
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正确答案
C

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