如何将.txt文件中的文本读入数组？ < >我想打开一个文本文件，并将其全部读入，同时使用C++将其内容存储到变量和数组中。下面是我的示例文本文件。我想将第一行存储到整数变量中，第二行存储到3d数组索引中，最后一行存储到字符串数组的5个元素中。我知道如何打开文件进行读取，但我还没有学会如何读取某些单词并将其存储为整数或字符串类型。我不知道如何在C++中实现这一点，非常感谢任何帮助。p> 3 2 3 3 4567 2939 2992 2222 0000

使用ifstream

std::ifstream input( "filename.txt" );

要能够逐行阅读：

for( std::string line; getline( input, line ); )
{
//do what you want for each line input here
}

使用ifstream

std::ifstream input( "filename.txt" );

要能够逐行阅读：

for( std::string line; getline( input, line ); )
{
//do what you want for each line input here
}

---

读取文本文件中的所有整数：

#include <fstream>

int main() {
    std::ifstream in;
    in.open("input_file.txt")
    // Fixed size array used to store the elements in the text file.
    // Change array type according to the type of the elements you want to read from the file
    int v[5];
    int element;

    if (in.is_open()) {
        int i = 0;
        while (in >> element) {
            v[i++] = element;
        }
    }

    in.close();

    return 0;
}

---

读取文本文件中的所有整数：

#include <fstream>

int main() {
    std::ifstream in;
    in.open("input_file.txt")
    // Fixed size array used to store the elements in the text file.
    // Change array type according to the type of the elements you want to read from the file
    int v[5];
    int element;

    if (in.is_open()) {
        int i = 0;
        while (in >> element) {
            v[i++] = element;
        }
    }

    in.close();

    return 0;
}

试试这个：

#include <iostream>
#include <string>
#include <fstream>

int main()
{
    std::ifstream file("filename.txt"); // enter the name of your file here

    int firstLine;

    int secondLine;
    const int X = 3;
    const int Y = 1;
    const int Z = 1;
    int ***arr3D;

    std::string myArray[5];
    std::string myString;

    if (file.is_open())
    {
        // store the first line into an integer variable
        file >> firstLine;

        // store the second line into a 3d array index
        arr3D = new int**[X];
        for (int i = 0; i < X; i++)
        {
            arr3D[i] = new int*[Y];

            for (int j = 0; j < Y; j++)
            {
                arr3D[i][j] = new int[Z];

                for (int k = 0; k < Z; k++)
                {
                    file >> secondLine;
                    arr3D[i][j][k] = secondLine;
                }
            }
        }

        // store the final line into 5 elements of a string array
        int i = 0;
        while (file >> myString)
        {
            myArray[i] = myString;
            i++;
        }
    }

    file.close();


    std::cout << firstLine << std::endl;

    for (int i = 0; i < X; i++)
    {
        for (int j = 0; j < Y; j++)
        {
            for (int k = 0; k < Z; k++)
            {
                std::cout << arr3D[i][j][k] << std::endl;
            }
        }
    }

    for (int i = 0; i < 5; i++)
    {
        std::cout << myArray[i] << std::endl;
    }

    return 0;
}

试试这个：

#include <iostream>
#include <string>
#include <fstream>

int main()
{
    std::ifstream file("filename.txt"); // enter the name of your file here

    int firstLine;

    int secondLine;
    const int X = 3;
    const int Y = 1;
    const int Z = 1;
    int ***arr3D;

    std::string myArray[5];
    std::string myString;

    if (file.is_open())
    {
        // store the first line into an integer variable
        file >> firstLine;

        // store the second line into a 3d array index
        arr3D = new int**[X];
        for (int i = 0; i < X; i++)
        {
            arr3D[i] = new int*[Y];

            for (int j = 0; j < Y; j++)
            {
                arr3D[i][j] = new int[Z];

                for (int k = 0; k < Z; k++)
                {
                    file >> secondLine;
                    arr3D[i][j][k] = secondLine;
                }
            }
        }

        // store the final line into 5 elements of a string array
        int i = 0;
        while (file >> myString)
        {
            myArray[i] = myString;
            i++;
        }
    }

    file.close();


    std::cout << firstLine << std::endl;

    for (int i = 0; i < X; i++)
    {
        for (int j = 0; j < Y; j++)
        {
            for (int k = 0; k < Z; k++)
            {
                std::cout << arr3D[i][j][k] << std::endl;
            }
        }
    }

    for (int i = 0; i < 5; i++)
    {
        std::cout << myArray[i] << std::endl;
    }

    return 0;
}

---

像这样的问题太多了。搜索StAcExc++ C++文件数组，有很多问题。在网上搜索StAcExpLoad C++读取文件数组。我拒绝了，最近你也有类似的拒绝。请不要在问题中编辑其他人的代码！你永远无法知道你的特定编辑是否意外地解决了询问者的原始问题。坚持格式、语法和标记，如果有的话。我在你编辑的拒绝理由中写了同样多的内容，但我不确定你是否读过。谢谢。我拒绝了，你最近也拒绝了一个类似的。请不要在问题中编辑其他人的代码！你永远无法知道你的特定编辑是否意外地解决了询问者的原始问题。坚持格式、语法和标记，如果有的话。我在你编辑的拒绝理由中写了同样多的内容，但我不确定你是否读过。非常感谢。