merge files

[1vf9z8AR]

I want to merge two files such that contents of second file are appended to contents of first.The code is behaving very weird.

My code logic:
create first file
create second file
create a file named "new" which has contents of first and then second in it.

#include<iostream>
#include<fstream>
using namespace std;
 char filename[100];

void write()
{
    char filename[100],line[80],ch;
    cout<<"Enter name of file";cin.getline(filename,100);
    cout<<endl;
    ofstream w1;
    w1.open(filename);
    do
    {
        cout<<"Enter line";cin.getline(line,80);
        w1<<line;
        cout<<endl;
        cout<<"Enter more line?(y/n)";cin>>ch;
        cout<<endl;
    }while(ch=='y');
    w1.close();
}

void read()
{
    char s[80];
    ifstream r1;
    r1.open(filename);
    while(r1>>s)
    {
        cout<<s<<endl;
    }
    r1.close();
}

void merger()
{
    fstream s1("new",ios::out|ios::app);
    char s[80],l[80];
    ifstream q1;
    ifstream w1;
    q1.open(filename);
    w1.open(filename);
    while(q1>>s)
    {
        s1>>s;
    }
    while(w1>>l)
    {
        s1>>l;
    }
    w1.close();
    s1.close();
    q1.close();
    remove(filename);
    rename("new",filename);
}

int main()
{
    cout<<"Enter first file"<<endl;
    write();
    cout<<"First file"<<endl;
    read();
    cout<<"Enter second file"<<endl;
    write();
    cout<<"Second file"<<endl;
    read();
    cout<<"Merged file"<<endl;
    merger();
}

[Repeater]

Your code doesn't call your merging function.

[1vf9z8AR]

i edited it now.something happened while pasting

[Repeater]

Your merger function only opens one of the files. But it opens that file twice.

fstream s1("new",ios::out|ios::app);
What's this for? Looks like you create a new, empty file and then try to read from it. Should you be writing to it?