C++ :: Merging Input And Output Files

Write a program that opens two text files (input1.txt and input2.txt) for input and one for output (output.txt). The program should merge the two input files in the output files. While doing the merge, it will read one line from input1.txt and one line from input2.txt and write those in the output file one after other. Then it will read the next line from input1.txt and next line from input2.txt and write them one after other in the output file.

This is my code:

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main() {
ofstream myproject;
myproject.open("input1.txt");

[Code] .....

I need to:

1. how to get the second line in the input1.txt file and so on.
2. After the writing in output.txt, count the number of lines in output.txt.
3. write the number of times term ‘line’ appears in output.txt file.