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（callbyvalue）方式，第二个参数采用传引用（callbyreference）方式，则函数main（ ）执行后输出的值为（ ）。
- A.10
- B.19
- C.20
- D.29
正确答案及解析
正确答案
解析
传值调用中，形参取的是实参的值，形参的改变不会导致调用点所传的实参的值发生改变；而引用（传址）调用中，形参取的是实参的地址，即相当于实参存储单元的地址引用，因此其值的改变同时就改变了实参的值。
x=2*10-1=19；
a是引用传递，所以a=a+x=10+19=29，结果为29。
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