已知函数f（ ）、g（ ）的定义如下所示，调用函数f时传递给形参x的值是5。若g（a）采用引用调用（callbyreference）方式传递参数，则函数f的返回值为（请作答此空）；若g（a）采用值调用（callbyvalue）的方式传递参数，则函数f的返回值（ ）。其中，表达式“x>>1”的含义是将x的值右移1位，相当于x除以2。
- A.35
- B.32
- C.11
- D.7
正确答案及解析
正确答案
解析
传值调用：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。引用（传址）调用：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。本题中，a=x>>1，x值为5，则 a=2；采用传值调用时，由于 g(a)对数据x的运算不会影响原来x的值，所以a+x=5+2=7；采用传值调用时，由于 g(a)对数据x的运算会影响原来x的值，当执行g(a)后x的值为6，所以a+x=5+6=11 。
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