什么是未定义的引用此程序中的mergesort函数错误？ [英] What is undefined reference to mergesort function error in this program?

问题描述

#include<stdio.h>
#include<stdlib.h>
void merge(int left[],int right[],int a[],int half);
void mergesort(int a[],int n);
int main()
{
    int a[6]={3,4,8,1,2,4}; int i;
    mergesort(a,6);
    for(i=0;i<6;i++)
        printf("%d\t",a[i]);

    return 0;
}
void merge(int left[],int right[],int a[],int half)
{
    int i=0,j=0,k=0;
    while(i<half&&j<half)
    {
        if(left[i]<right[j])
        {
          a[k]=left[i];
          i++;
        }
        if(right[j]<left[i])
        {
            a[k]=right[j];
            j++;
        }
    }
    if(i==half)
    {
        for(j=j;j<half;j++)
        {
            a[k]=right[j];
            k++;
        }
    }
    if(j==half)
    {
        for(i=i;i<half;i++)
        {
            a[k]=left[i];
            k++;
        }
    }

void mergesort(int a[],int n)
{
    int half=n/2,i;
    int left[half];
    int right[half];
    for(i=0;i<half;i++)
        left[i]=a[i];
    for(i=0;i<half;i++)
        right[i]=a[i];
    mergesort(left,half);
    mergesort(right,half);
    merge(left,right,a,half);
}
}

推荐答案

作为 Wes Aday [ ^ ]指出你在 merge 函数中缺少一个右大括号，并且在 mergesort functtion

As Wes Aday[^] pointed out it looks like you're missing one closing brace in the merge function and there's one extra after mergesort functtion

您在这里的问题仅仅是因为它比自己搜索更容易吗？



查看文档，谷歌查看错误消息。



认为我很粗鲁？这是让您练习和学习语言的典型作业。你不能让别人为你学习编程。



建议

- 学习语言。你不会总是问答答来学习这门语言。

- 你的语言文件是你的朋友。

- 错误信息是你的朋友。它告诉你你的代码不符合你的想法。

- 调试器是你的朋友。滥用调试器。

- 教程网站是你的朋友。

- 谷歌是你的朋友。你会发现有很多MergeSort snipsets。



我看到至少12个错误，其中大部分错误很多次。

- 程序永远不会结束。

- 程序松散了一些数据。

- ...

Are your asking here simply because it is easier than searching by yourself?

Look at documentation, google the error message.

Think I am rude ? This is typical homework to have you practice and learn the language. You can't have somebody to learn programming for you.

Advice
- Learn the language. You will not learn the language by always asking the answer.
- Your language documentation is your friend.
- The error message is your friend. it tells you that your code don't do what you think it is.
- The debugger is your friend. Abuse of debugger.
- Tutorial sites are your friends.
- Google is your friend. You will find there numerous MergeSort snipsets.

I see at least 12 errors and most of them many times.
- the program never end.
- the program loose some data.
- ...

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