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.3
- C.8
- D.10
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。
在函数执行的过程中,f(5,x)?f(int x,int &a)可以得出第一个参数x的取值为5(第一个参数为传值调用);第二个参数a取得左边main()函数中x的地址(第二个参数为传址调用);当运行x=2*a-1后,f()函数中x的取值变为3(2*2-1);当运行a=x+5后,a对应地址的取值被修改为8,也就是将main()函数中的x值修改为8;当运行return后,f()函数结束。这时main()函数中的x取值为8;所以当main()函数答应x值时,应该输出为8。
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