C编程哪个更好，哪个更喜欢请解释 [英] C programming which is better and which one to prefer please explain

问题描述

#include<stdio.h>
int add(int,int);
int main()
{
	int first,second,sum;
	printf("Enter your first number : ");
	scanf("%d",&first);
	printf("Enter your second number : ");
	scanf("%d",&second);
	printf("sum = %d ",add(first,second));
}
int add(int x,int y)
{
	int sum;
	sum=x+y;
	return sum;
}

或

OR

#include<stdio.h>
void add()
int main()
{
	add();
}
void add()
{
int first,second,sum;
printf("Enter your first number : ");
scanf("%d",&first);
printf("Enter your second number : ");
scanf("%d",&second);
sum=first+second;
printf("sum =%d",sum);
}

我的尝试：



两者都给出了正确的答案但更喜欢哪一个请解释

What I have tried:

Both gives right answer but which one to prefer please explain

推荐答案

说实话，这是风格问题 - 第二个版本更好对于更大的函数，但对于一个简单的代码行，我更喜欢第一行。



好​​吧，编译器可能会内联代码 - 它们是这些天非常聪明 - 所以不会有性能开销，但编写一个函数来添加两个数字有点超过顶部！ ：笑：



我要做的是编写一个函数，它会提示并取一个用户inptu并返回它：

To be honest, it's a matter of style - and the second version is better for "larger" functions, but for a single trivial line of code I'd prefer the first.

OK, the compiler will probably inline the code anyway - they are pretty clever these days - so there won't be a performance overhead, but writing a function to add two numbers is a bit over the top! :laugh:

What I would do is write a function that takes a prompt and fetches a user inptu and returns it:

int GetInt(const char *prompt)
    {
    int result;
    printf(prompt);
    scanf("%d", &result);
    return result);
    }

然后使用两次：

And then use that twice:

int main()
    {
    int first,second,sum;
    first = GetInt("Enter your first number : ");
    second = GetInt("Enter your second number : ");
    printf("sum = %d\n", first + second));
    }

这一个：

This one:

#include<stdio.h>
int main()
{
  int first,second;
  printf("Enter your first number : ");
  scanf("%d",&first);
  printf("Enter your second number : ");
  scanf("%d",&second);
  printf("sum = %d\n", (first + second));
  return 0;
}

引用：

C编程哪个更好请更喜欢请解释

C programming which is better and which one to prefer please explain

对此没有明确的答案，这是一个品味问题。

我本可以写两个，对于这样的一个小项目，没有区别。

如果 add 将被重用于不同的东西，首先是样式。

There is no definitive answer to this, it is a matter of taste.
I could have written both, for such a small project, there no difference.
if add is to be reused for different things, first style is preferable.

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