C/C++/QT/Python/MATLAB获取文件行数的示例

1. C获取文件行数

#include <stdio.h>int main() {FILE *file = fopen("path/to/your/file.txt", "r");if (file == NULL) {printf("Failed to open the file!\n");return 0;}int lineCount = 0;char ch;while ((ch = fgetc(file)) != EOF) {if (ch == '\n') {lineCount++;}}printf("Line count: %d\n", lineCount);fclose(file);return 0;
}

2. C++获取文件行数

#include <iostream>
#include <fstream>
#include <string>int main() {std::ifstream file("path/to/your/file.txt");if (!file) {std::cout << "Failed to open the file!" << std::endl;return 0;}int lineCount = 0;std::string line;while (std::getline(file, line)) {lineCount++;}std::cout << "Line count: " << lineCount << std::endl;file.close();return 0;
}

3. Qt获取文件行数

#include <QCoreApplication>
#include <QFile>
#include <QTextStream>
#include <QDebug>int main(int argc, char *argv[])
{QCoreApplication a(argc, argv);QFile file("path/to/your/file.txt");if (!file.open(QIODevice::ReadOnly | QIODevice::Text)){qDebug() << "Failed to open the file!";return a.exec();}QTextStream in(&file);int lineCount = 0;while (!in.atEnd()){QString line = in.readLine();lineCount++;}qDebug() << "Line count: " << lineCount;file.close();return a.exec();
}

4. Python获取文件行数

file_path = 'path/to/your/file.txt'try:with open(file_path, 'r') as file:line_count = sum(1 for line in file)print(f"Line count: {line_count}")
except IOError:print("Failed to open the file!")

5. MATLAB获取文件行数

• 方法一：使用numel函数

  filename = 'your_file.txt';  % 文件名
  fileID = fopen(filename, 'r');  % 打开文件
  data = textscan(fileID, '%s', 'Delimiter', '\n');  % 按行读取数据并存储在一个单元格数组中
  fclose(fileID);  % 关闭文件numLines = numel(data{1});  % 计算行数
  disp(['文件行数为：', num2str(numLines)]);
  

• 方法二：使用size函数

  filename = 'your_file.txt';  % 文件名
  fileID = fopen(filename, 'r');  % 打开文件
  data = textscan(fileID, '%s', 'Delimiter', '\n');  % 按行读取数据并存储在一个单元格数组中
  fclose(fileID);  % 关闭文件numLines = size(data{1}, 1);  % 计算行数
  disp(['文件行数为：', num2str(numLines)]);