最好的做法 - 主要内声明的函数原型？ [英] Function prototype declared inside main - best practice?

问题描述

这是一个良好的作风有main函数内声明的函数原型？

我一直在寻找一个C教程，我觉得是相当过时。然而，他们宣称的主要内部函数原型。我通常在main外面声明

 的#include＆LT;＆stdio.h中GT;诠释的main（）
{
    烧焦MYNAME [30];
    INT theage;
    INT getage（）;    的printf（\\ n输入您的姓名：）;
    得到（MYNAME）;
    theage = getage（）;
    的printf（\\ n年龄=％d个和NAME =％S，theage，MYNAME）;
    返回0;
}INT getage（）
{
    INT myage; / *本地只getage（）* /    的printf（\\ n输入您的年龄：）;
    scanf函数（％d个，＆安培; myage）;
    返回（myage）;
}
 

解决方案

我个人会说不有以下几个原因：

• 这让code主更长


• 这可能会混淆一个新手进入思考ING功能由主
范围

• 在实际code，我通常把功能不同的编译单元和＃包括其头文件

Is this a good style to have the function prototype declared inside of the main function?

I was looking at a C tutorial, I think is quite out of date. However, they declare the function prototype inside of main. I normally declare outside before main.

#include <stdio.h>

int main ()
{
    char myname [30];
    int theage;
    int getage ();

    printf ("\nEnter your name:");
    gets (myname);
    theage = getage ();
    printf("\n AGE = %d and NAME = %s", theage, myname);
    return 0;
}

int getage ()
{
    int myage; /* local to only getage() */

    printf ("\nEnter your age: ");
    scanf ("%d",&myage);
    return (myage);
}

解决方案

I personally would say "no" for several reasons:

• it makes the code for main longer
• it may confuse a newbie into think ing the function is scoped by main
• in real code, I would normally put the function in a different compilation unit and #include its header file

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