Question

Hello, I'm having trouble solving this problem. I have tried some other codes and they seem like they work but I am not sure how the files are made or how this code works. It will be helpful that you show me how. Thank you so much. (In C++)

Write a program find that searches all files specified on the command line and prints out all lines containing a keyword. For example, if you call find Tim report.txt address.txt homework.cpp then the program might print report.txt: discussed the results of my meeting with Tim T address.txt: Torrey, Tim|11801 Trenton Court|Dallas ITX address.txt: Walters, Winniel59 Timothy Circle|DetroitIMI homework.cpp: Time now; The keyword is always the first command-line argument.

Answer 1

If you have any doubts, please give me comment...

#include <iostream>
#include <fstream>
using namespace std;
void findKeyWord(string fileName, string key)
{
    ifstream fin;
    fin.open(fileName.c_str());
    if (!fin.is_open())
        cout << "Unable to open the input file." << endl;
    else
    {
        string line;
        while (!fin.eof())
        {
            getline(fin, line);
            if (line.find(key) != -1)
                cout << fileName << ": " << line << endl;
        }

        fin.close();
    }
}
int main(int argc, char **argv)
{
    if (argc < 3)
    {
        cout << "Invalid number of parameters." << endl;
        return 0;
    }
    for (int i = 2; i < argc; i++)
        findKeyWord(argv[i], argv[1]);
}