C++ QUESTION! Someone else posted an answer to this question, but it\'s wrong. P

Question

C++ QUESTION!

Someone else posted an answer to this question, but it's wrong. Please help me with this question! Thank you.

You may program the below as individual programs or in OOP style using a class and methods.

1. Write a program which will read an input file (text file ONLY) and write output to another file. Manage file i/o errors.

2. Given an input text file, write a program which will double space the file. For example if the file has

INPUT:

Information Society band still rocks

Java handles Generics better than C++ templates.

OUTPUT: (ie double spaced will be)

Information Society band still rocks

Java handles Generics better than C++ templates.

END OF OUTPUT:

3. Given a input file with text, write a program to read from the file, alternate lines (ie either line 1 3 5 etc or line 2 4 6 etc) and print the output to console aka standard output.

4. Write a function which will take a pointer to a string as an argument. This function will recursively reverse-print the string character by character. Demo the use of this function in a program.

Explanation / Answer

//You may program the below as individual programs or in OOP style using a class and methods.
//1. Write a program which will read an input file (text file ONLY) and write output to another file. Manage file i/o errors.
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
ifstream infile("input.txt");
ofstream outfile("output.txt");
if(!infile)
{
cout<<"unable to open file .so exiting from program " << endl;
return 0;
}
string str;
while(!infile.eof())
{
getline(infile,str);
outfile << str << endl;
}
infile.close();
outfile.close();
return 0;
}

// 2. Given an input text file, write a program which will double space the file. For example if the file has
// INPUT:
// Information Society band still rocks
// Java handles Generics better than C++ templates.
// OUTPUT: (ie double spaced will be)
// Information Society band still rocks
// Java handles Generics better than C++ templates.
// END OF OUTPUT:
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
ifstream infile("input.txt");
ofstream outfile("output.txt");
if(!infile)
{
cout<<"unable to open file .so exiting from program " << endl;
return 0;
}
string str;
while(!infile.eof())
{
getline(infile,str);
for(int i=0; i<str.length(); i++)
{
if(str[i] == ' ') outfile << str[i] << str[i];
else outfile << str[i];
}
outfile << endl;
}
infile.close();
outfile.close();
return 0;
}

// 3. Given a input file with text, write a program to read from the file, alternate lines (ie either line 1 3 5 etc or line 2 4 6 etc)
// and print the output to console aka standard output.
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
ifstream infile("input.txt");
if(!infile)
{
cout<<"unable to open file .so exiting from program " << endl;
return 0;
}
string str;
int i=0;
while(!infile.eof())
{
i++;
getline(infile,str);
if(i%2!=0) cout << str << endl;
}
infile.close();
return 0;
}

// 4. Write a function which will take a pointer to a string as an argument. This function will recursively reverse-print the string character by character.
// Demo the use of this function in a program.
#include<iostream>
#include<cstring>
using namespace std;
void print_reverse(char *str)
{
if(*str=='') return;
else
{
print_reverse((str+1));
cout <<*str;
}
}

int main()
{
print_reverse("kumar");
return 0;
}

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