Question

我目前正在一个项目中，该项目从文本文件读取表格的内容和尺寸后显示表格。

puzzle.txt的内容：

5 5
ferac
asdvb
mfkgt
opemd
welsr

我希望程序读取左边的数字并将其存储在变量numRow中，并将右边的数字存储在numCol中，然后将字母读入拼图数组。但是，当打印尺寸编号时，它们打印为0 0而不是5 5，并且拼图数组仅输出空框字符。

#include <iostream>
#include <map>
#include <fstream>
#include <cstring>
#include <string>

using namespace std;
char puzzle [numRow][numCol];

void initializePuzzle() {

    string storeInput;
    int numRow, numCol;

    cout << "What is the name of the file?" << endl;
    getline(cin, storeInput);

    ifstream inFile (storeInput);
    inFile.open(storeInput.c_str());

    for (int c = 0; c < sizeof(storeInput); c++) {
        if (c == 0) {
            inFile >> numRow >> numCol;
            cout << numRow << ' ' << numCol << endl;
        }
    }

    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 5; j++) {
            inFile >> puzzle[i][j];
        }
    }
}

void displayPuzzle() {

    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 5; j++) {
            cout << puzzle[i][j];
        }
        cout << endl;
    }

}

int main() {

    initializePuzzle();
    displayPuzzle();

    return 0;
}

Answer 1

您只需使用 C ++标准库即可完成此操作。尝试：（请参见std::copy()，std::array和std::vector ...）

#include <iostream>  // For std::cout, std::endl, etc.
#include <fstream>   // For std::ifstream
#include <vector>    // For std::vector
#include <iterator>  // For std::ostream_iterator

int main() {
    std::string file_src;
    // Ask for file name...
    std::cout << "What is the name of the file? " << std::endl;
    std::getline(std::cin, file_src);

    // Declare the file stream...
    std::fstream reader(file_src);
    // Terminate the program with value '1' in case of failure when reading file...
    if (reader.fail()) return 1;

    // Declaring necessary varibles...
    unsigned num_row, num_column;
    std::string temporary;

    /* Extracting 'num_row' and 'num_column' and declaring a 'std::vector' (which are
       better than dynamic arrays in numerous ways) with the dimensions... */
    reader >> num_row >> num_column;
    std::vector<std::vector<char>> puzzle(num_row, std::vector<char>(num_column));

    // Iterating over each line and copying the string where required...
    for (auto i = 0; std::getline(reader, temporary, '\n') && i < num_row; i++)
        if (!temporary.empty())
             std::copy(temporary.begin(), temporary.end(), puzzle[i].begin());
        else --i;

    // Close the stream...
    reader.close();

    // Print the resulting vector...
    for (auto & elem : puzzle) {
        std::copy(elem.begin(), elem.end(), std::ostream_iterator<char>(std::cout, " "));
        std::cout << std::endl;
    }
    return 0;
}

示例：

输入：


puzzle.txt



输出：


f e r a c
    a s d v b
    m f k g t
    o p e m d

从文本文件中读取尺寸和表格内容后显示表格

1 个答案: