#include <iostream>
#include <fstream>

using namespace std;

void merge(ifstream& input1, ifstream& input2, ofstream& output);
// Precondition:
// The input files are text files.
// The input files have been opened.


int main()
{
ifstream infile1, infile2;
ofstream outfile;
char inName1[11], inName2[11], outName[12];

int next;

cout << "Enter the first of two input file names: " << endl;
cin >> inName1;

cout << "Now a second input file name " << endl;
cin >> inName2;

cout << "Enter the output file name. (WARNING: ANY EXISTING FILE WITH THIS NAME WILL) BE ERASED." << endl;
cin >> outName;


//closing files prior to reopening them for display

//must open file outName as an ifstream to read it.
infile1.open(inName1);
infile2.open(inName2);
outfile.open(outName);

merge(infile1, infile2, outfile);


//Output the content of inName1 in here
cout << "Contents of file " << inName1 << " are: " << endl;

//Output the content of inName2 in here
cout << "Contents of file " << inName2 << " are: " << endl;

//Output the content of outName in here
cout << "Contents of merged file " << outName << " are:" << endl;

infile1.close();
infile2.close();
outfile.close();
return 0;

}

void merge(ifstream& input1, ifstream& input2, ofstream& output)
{
    int num1;
    int num2;

    input1 >> num1;
    input2 >> num2;

    while (!input1.eof() && !input2.eof()) {
        if (num1 < num2) {
        output << num1;
        input1 >> num1;
        }

    else {
        output << num2;
        input2 >> num2;
    }
    }
}
// END The REAL merge