c++ - 数组和字符串 C++ 的各种数据验证文件 I/O 实践

Question

#include <fstream>
#include <iostream>
#include <string>
#include <iomanip>
#include <array>
#include <sstream>

using namespace std;
void NumberSummaryList(string);
void Validation(string);

int main()
{
string file = "";
cout << "Hello, what is the name of the number file that you would like to process, please don't forget to include .txt   " << "-For Example-   data.txt" << endl;
cin >> file;
try
{
    ifstream DataIn;
    DataIn.open(file);
    if (DataIn.is_open() == false)
    {
        throw 20;
    }
}
catch (int e)
{
    cout << "An error has occurred with opening the file." << endl;
}

NumberSummaryList(file);
Validation(file);
}

void NumberSummaryList(string file)
{
    ifstream DataIn;
    DataIn.open(file);
    const int NumbersArray = 100;
    int numbers[NumbersArray];
    int count;
    int x;
    int min = 0;
    int max = 0;
    int temp = 0;
    float sum = 0;
    float avg = 0;
    count = 0;



    while (!DataIn.eof())
    {
        DataIn >> numbers[count];
        count++;
    }
    x = count;

    DataIn.close();


    for (int count = 0; count < x; count++)
    {
        cout << numbers[count] << "\n";
    }

    min = numbers[0];
    max = numbers[0];

    for (int count = 0; count < x; count++)
    {
        temp = numbers[count];
        if (temp < min)
            min = temp;
        if (temp > max)
            max = temp;
    }

    for (int count = 0; count < x; count++)
    {
        sum += numbers[count];
    }

    avg = sum / x;

    ofstream OutData;
    OutData.open("listsummary.txt");

    cout << "The total of numbers read in the data file is " << x << endl;
    cout << "The average of all numbers in the data file is " << avg << endl;
    cout << "The max value of the data file is " << max << endl;
    cout << "The min value of the data file is " << min << endl;

    OutData << "The total of numbers read in the data file is " << x << endl;
    OutData << "The average of all numbers in the data file is " << avg << endl;
    OutData << "The max value of the data file is " << max << endl;
    OutData << "The min value of the data file is " << min << endl;

    OutData.close();
}

void Validation(string file)
{
    ifstream DataInStrings;
    DataInStrings.open(file);
    int count = 0;
    string stringarray[100];
    int intarray[100];
    int y = 0;
    for (int count = 0; count < 100; count++)
    {

        getline(DataInStrings, stringarray[count]);

        if (stringarray[count].length() > 5)
        {
            cout << "Error Found! The element in position " << count + 1 << " " << stringarray[count] << " is too long. Error Written." << endl;
        }
        else
        {

        }

    }


    for (int count = 0; count < 100; count++)
    {
        string CopyofArray;
        CopyofArray = stringarray[count];

        int intcopy = stoi(CopyofArray);

        if (intcopy < 0)
        {
            cout << "Error Found! The element in position " << count + 1 << " " << stringarray[count] << " is negative. Error Written." << endl;
        }
        else
        {

        }


    }




    for (int count = 0; count < 100; count++)
    {
        cout << stringarray[count] << "\n";
    }

    string ArrayCopy;
    ArrayCopy = stringarray[count];

    //if (isalpha(ArrayCopy))
    //{

    //}
    //else
    //{
    //  cout << "Alphabetical characters detected in the file, error written." << endl;
    //}


    DataInStrings.close();
}

大家好。这是一个我坚持并努力解决的课程项目。目标是验证我加载的文件中的一些数据，这些数据应该是数字 1-100。如果文件包含任何字母数字、符号（如？），我的老师要求我写出错误。或 /，如果元素的长度大于 5，并且数字为负数。

该程序还应该显示文件 1-100 的内容，查找读取的最大、最小、平均值和总数。

我已成功读取文件，找到读取的最大、最小、平均值和总数。如果数字太长或为负数，我也已成功对其进行编程以写出错误。

但是，每当文件包含字母数字或符号时，我的麻烦就来了。如果我尝试测试在数据文件中放置字母数字或符号，则该文件根本不会加载并且程序将无法正常运行。

我尝试重写程序以首先使用 getline 并读取字符串，然后在需要时进行转换。但它现在有一个问题，即在找到字母数字后程序不会计算的地方。

我在这里以正确的方式寻求建议或某种方向。我的老师让我们先编写程序的一部分，然后添加数据验证部分，这让我很生气，因为它在不同的地方把整个事情搞混了。

我期待任何...请，谢谢大家！

标签： c++arraysstringvalidation