Question

#include<iostream>
#include<fstream>
#include<cstring>

using namespace std;

int main()
{
    cout << "Hello.";

    ifstream attack,output;

    attack.open("CattackList");
    output.open("finaltestOutput.txt");

    if (!attack)
        cout << "file1 not opened.\n";
    if (!output)
        cout << "file2 not opened.\n";

    char buf1[100],buf2[100];
    attack.getline(buf1,100);

    int count = 0, C=0;

    cout << "hello";

    while (!attack.eof())
    {
        C++;

        cout << "ok";

        output.open("finaltestOutput");

        while (!output.eof())
        {
            output.getline(buf2, 80);
            if (strncmp(buf1, buf2, 51) == 0)
            {
                cout << buf2 << endl;
                count++;
            }
        }
        attack.getline(buf1, 80);
    }
    cout << "\nTotal Attacks : " << C << endl;
    cout << "Attacks detected: " << count << endl;
    return 0;
}

I am not able to get even the first “Hello” to get printed…

Answer 1

Let’s see…

#include<iostream>
#include<fstream>
#include<cstring>

Please put a space after each #include.

if (!attack)
    cout << "file1 not opened.\n";
if (!output)
    cout << "file2 not opened.\n";

Error messages should go to cerr, not cout.

char buf1[100],buf2[100];
attack.getline(buf1,100);

Did you allow space for the null at the end of the string? Also, one space after each comma.

int count = 0, C=0;

Spaces around binary operators such as =. Also, single letter variable names are discouraged.

    output.open("finaltestOutput");

You already opened this file. Why are you opening it again? Also, points off for naming an input file stream output.

        output.getline(buf2, 80);
        if (strncmp(buf1, buf2, 51) == 0)

Where are you getting the numbers 80 and 51?

There may be more; start with that.