Question

3. Write a program that asks the user for the name of two input files and appends the data from the second file onto the first file. To be clear: the second file should be unchanged, and the first file should end up holding all its own data followed by all the data from the second file. Be sure to handle the potential error of a missing data file appropriately.

Answer 1

Here is the code for you:

#include <iostream>
#include <fstream>
using namespace std;
int main()
{
string fileName;
cout<<"Enter the name of the first file: ";
cin>>fileName;
fstream fapp;
fapp.open(fileName, fstream::app);
if(!fapp.is_open())
{
cout<<"Unable to open the first file....\nQuitting......"<<endl;
return 0;
}
cout<<"Enter the name of the second file: ";
cin>>fileName;
ifstream fin;
fin.open(fileName);
if(!fin.is_open())
{
cout<<"Unable to open the second file....\nQuitting......"<<endl;
return 0;
}
string temp;
while(!fin.eof())
{
getline(fin, temp);
fapp<<temp<<endl;
}
fin.close();
fapp.close();
}

And the output screenshot is:

《 Terminal Shell Edit View Window Help O < > 4)) 100% (ED Mon 28 Nov 18:36 ANANDA KUMAR THUMMAPUDI a : ConcatSecondFileToFin cpp Currently Open Docum.. /HomeworkLibCPP/ConcatSecondFileToFirst.cpp. ChangeColorO Concat2Files.... ConcatSecond one.txt two.txt untitled text 4.... #include <iostream> #include <fstream> using namespace std; int main() 4 HomeworkLibCPP--bashー117x31 string fileName; cout<<" Enter the name of the first file:" cin>>fileName; fstream fapp; fapp.open(fileName, fstream: :app); if (!fapp.is_open ()) HomeworkLibCPPbash /HomeworkLibCPPbash Macintosh:HomeworkLibCPP AnandaKumarThummapudis g+ ConcatSecondFileToFirst.cpp Macintosh: HomeworkLibCPP AnandaKumarThummapudis cat one.txt this is the first file. this is an experiment. this puts the end to first file 10 cout«c"Unable to open the first file \nQuittir Macintosh: HomeworkLibCPP AnandaKumarThummapudis cat two. txt here comes the start of second file. this is second file this is an experiment too. here comes the end of second file again. Macintosh: HomeworkLibCPP AnandaKumarThummapudi$ ./a.out Enter the name of the first file: one.txt Enter the name of the second file: two.txt Macintosh: HomeworkLibCPP AnandaKumarThummapudis cat one.txt this is the first file. return 0; 14 16 18 cout<<"Enter the name of the second file:"; cin>>fileName; ifstream fin; fin.open (fileName): if(!fin.is_open )) cout<<"Unable to open the second file....nQuitti this is an experiment. return 0; this puts the end to first file. here comes the start of second file. this is second file this is an experiment too. here comes the end of second file again. string temp; while( !fin.eof)) 26 getline (fin, temp); fapp<<temp<<endl; 28 Macintosh: HomeworkLibCPP AnandaKumarThummapudis cat two.txt here comes the start of second file. this is second file this is an experiment too. here comes the end of second file again. Macintosh: chegaCPP AnandaKumarThummapudis י fin.close; fapp.close); C13 de UTF-8 Saved: 28/11/16, 6:35:00 PM 668 / 79 / 33 100%