函数main()、f()的定义如下所示。调用函数f()时，第一个参数采用传值（call by value）方式，第二个参数采用传引用（call by reference ）方式，main()执行后输出的值为（ ）。
- A.2
- B.4
- C.5
- D.8
正确答案及解析
正确答案
解析
f(int x, int&a)函数中 x=2*2+1=5; a=5+3=8, 且a是引用，对应main()函数中x，所以x的值为8.
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