C++:从命令行读取文件名并在我的文件中使用它

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

using namespace std;

int main(int argc, char *argv[]) {
    if (argc < 2) {
        cout << "Usage: "<< argv[0] << " filename"<< endl;
        return 1;
    }

    string filename = argv[1];

    ifstream inputFile(filename);
    if (!inputFile.is_open()) {
        cout << "Error: Unable to open file "<< filename<< endl;
        return 1;
    }

    string line;
    while (getline(inputFile, line)) {
        cout<< line<< endl;
    }

    inputFile.close();

    return 0;
}