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C++ written test questions to implement simple error recording function

Apr 24, 2019 pm 02:51 PM
c++

本篇文章,小编将和大家分享一个有意思的C++笔试题,要求实现简单错误记录的功能,感兴趣的朋友可以了解一下,希望能对你的C++开发学习有所帮助。

题目介绍:

开发一个简单错误记录功能小模块,能够记录出错的代码所在的文件名称和行号。 要求:

1.记录最多8条错误记录,对相同的错误记录(即文件名称和行号完全匹配)只记录一条,错误计数增加;(文件所在的目录不同,文件名和行号相同也要合并);

2.超过16个字符的文件名称,只记录文件的最后有效16个字符;(如果文件名不同,而只是文件名的后16个字符和行号相同,也不要合并);

3.输入的文件可能带路径,记录文件名称(只记录文件名)不能带路径 。

例:

输入:

E:\\linuas\\desktop\\demo.txt 1234

E:\\linuas\\desktop\\demo.doc 1234

E:\\linuas\\desktop\\demo.txt 1234

输出:

demo.txt 1234 2

demo.doc 1234 1

分析:

解决方案里用到了pair(包含两种格式的数据结构)、make_pair(构造pair)、vector(栈)、find(找到字符串中指定字符位置)、erase(删除部分字符串)、substr(截取字符串)等用法,值得记录一下,免得后期学习忘记。解决方案高效而使用,不可多得。

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;
bool compare(pair<string, int> a, pair<string, int> b) {
    return a.second > b.second;
}
int main(void) {
    string input, file;
    vector<pair<string, int>> errors;
    while (getline(cin, input)) {
        if (input.size() == 0)
            break;
        unsigned int f = input.rfind(&#39;\\&#39;);
        file = input.substr(f + 1);
        errors.push_back(make_pair(file, 1));
        for (int i = 0; i<(errors.size() - 1); i++) {
            if (errors[i].first == file) {
                errors[i].second++;
                errors.pop_back(); break;
            }
        }
    }
    stable_sort(errors.begin(), errors.end(), compare);
    int idx = 0;
    while (idx<8 && idx<errors.size()) {
        string check = errors[idx].first;
        int t = check.find(&#39; &#39;);
        if (t>16)
            errors[idx].first.erase(0, t - 16);
        cout << errors[idx].first << &#39; &#39; << errors[idx].second << endl;
        idx++;
    }
}
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结果:

 相关教程:C++视频教程

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