函数main（ ）、f（ ）的定义如下所示，调用函数们f（ ）时，第一个参数采用传值（callbyvalue）方式，第二个参数采用传引用（callbyreference）方式，main（ ）函数中“print（x）”执行后输出的值为（ ）。
- A.11
- B.40
- C.45
- D.70
正确答案及解析
正确答案
解析
当值传递的时候，将原来的参数复制了一份，但是引用传递的时候是将变量本身传了出去，因此，a代表的其实就是x本身，f函数里面的x是另一个变量，只有a的变化才能导致main函数里面的x值的变化。
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