Question

我的任务如下：我收到的文本文件中包含 8行的数字，每行包含 7个数字。我将采用这些数字，读取并将它们转移到一个新文件中。然后从新文件的新行中获取数据，我必须执行以下操作：

在每个 7个数字中找到最高和最低数字。

我的教授教我们基本的文件处理。我只知道如何使用循环，if和else，以及您在此代码中看到的文件处理范围。

#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
using namespace std;
int main()
    {
    //MY VARIABLES
    float avg;
    int number, line, max, min;
    int counter = 1;
    int sum;

    //OPENING FILES
    ifstream fromFile;
    ofstream toFile;
    toFile.open("NumberInFile.txt");
    fromFile.open("NumberFile.txt");

    while (!fromFile.eof())  // READ EVERY NUMBER FROM THE FILE
    {       

        if (counter <= 7)                  //LINE #1
        {
            cout << "Line 1: ";
            int sum = 0;
            do
            {
                fromFile >> number;
                toFile << number << " ";
                cout << number << " ";
                line = 1;
                counter++;
                sum += number;
            } while (counter <= 7);
            toFile << "\n";
        }       
        else if (counter > 7 && counter <= 14)          //LINE #2
        {
            cout << "\nLine 2: ";
            do
            {
                fromFile >> number;
                toFile << number << " ";
                cout << number << " ";
                line = 2;
                counter++;
            } while (counter > 7 && counter <= 14);
            toFile << "\n";
        }
        else if (counter > 14 && counter <= 21)         //LINE #3
        {
            cout << "\nLine 3: ";
            do
            {
                fromFile >> number;
                toFile << number << " ";
                cout << number << " ";
                line = 3;
                counter++;
            } while (counter > 14 && counter <= 21);
            toFile << "\n";
        }

    }
    //CLOSES FILES
    toFile.close();
    fromFile.close();

    system("pause");
    return 0;
}

Answer 1

进行以下更改，如果您不理解任何内容，请自由询问：

#include <iostream>
#include <fstream>
using namespace std;
int main()
    {
    //MY VARIABLES
    int number, max, min, sum;

    //OPENING FILES
    ifstream fromFile;
    ofstream toFile;
    toFile.open("SecondFile.txt"); //Don't overwrite the same file
    fromFile.open("NumberFile.txt");
    //IF FILE DIDN'T OPEN SUCCESSFULLY
    if (!fromFile)
    {
        cout << "There was an error" << endl;        
        exit(1);
    }
    //IF FILE OPENED SUCCESSFULLY
    else
    {
        cout << "No error, file opened successfully" << endl;
        toFile << "This file contains the calculations for this project" << endl;
    }                                                                     
    while (!fromFile.eof())   //WILL LOOP UNTIL IT HAS READ EVERY NUMBER FROM THE FILE
    {  
        for(int i=1; i<=8; i++){        //LOOP for counting rows
            cout <<"\nLine "<<i<<": ";
            int sum = 0;
            max = 0;
            min = 0;
            int j=1;
            do
            {
                fromFile >> number;
                if(max == 0 && min == 0){
                    max = number;
                    min = number;
                }
                if(number > max){
                    max = number;
                }
                else if(number < min){
                    min = number;
                }
                toFile << number << " ";
                cout << number << " ";
                j++;
                sum += number;
            } while (j <= 7);
            toFile << "Max: "<<max<<", Min: "<<min<<", Sum: "<<sum<<", Average: "<<sum/7<<endl;

        }
     }
    //CLOSES FILES
    toFile.close();
    fromFile.close();
    return 0;
}

输入文件：

输出文件：

查找文件中的最高和最低编号

1 个答案: