推荐回答(1个)
,butler
的函数原型中,第一个
void
指明
butler
函数没有返回值;第二个
void
表明
butler
没有参数,也就是不接收任何参数。在
main
函数前面写了
butler
的函数原型后,当
main
函数调用
butler
时,编译器就能检测到
butler
函数调用语句是否正确。如果
main
函数前面没有
butler
的函数原型,那么我们就不能在
main
函数中调用
butler
函数,除非我们把函数定义放在
main
函数之前。不过把函数定义置于
main
函数之前是一种不好的编程风格,因为这将导致我们花不少时间来寻找
main
函数的所在地。想象一下,如果我们写了几十个函数,如果每个函数定义都置于
main
函数之前,那样
main
函数还算好找;但是如果我们不小心把某些函数放在了
main
函数后面,也就是说
main
函数被放在一堆函数中间,那就很难找了!
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