Question

Write a C++ Program to do following:

1. Read every character from file char.txt using "get" and write it to a file char.bak using "put"

2. Read every second character from file char.txt using "get" and write it to a file charalternate.txt using "put" and "ignore"

3. Take input from user for offset and number of characters. For example if user enters 5 for offset and 10 for number of characters, then your program should copy 10 bytes from file char.txt from position 5 and write it a file named byteswritten.txt.

Answer 1

Question 1:

Here is code:

#include <iostream>

#include <fstream>

using namespace std;

int main()

{

ifstream in("char.txt");

ofstream outfile ("char.bak");

if (!in)

{

cout << "Cannot open file.\n";

return 1;

}

char c;

while (in)

{

in.get(c);

if (in)

outfile.put(c);

}

in.close();

outfile.close();

return 0;

}

char.txt:

nibh in quis justo maecenas rhoncus aliquam lacus morbi quis tortor id nulla ultrices aliquet
vivamus in felis eu sapien cursus vestibulum proin eu mi nulla ac
curabitur convallis duis consequat dui nec nisi volutpat eleifend donec ut dolor morbi
proin risus praesent lectus vestibulum quam sapien varius ut blandit non interdum in ante vestibulum ante
vivamus vel nulla eget eros elementum pellentesque quisque porta volutpat erat quisque erat eros viverra

char.bak:

Question 2:

Here is code:

#include <iostream>

#include <fstream>

using namespace std;

int main()

{

ifstream in("char.txt");

ofstream outfile ("char.bak");

if (!in)

{

cout << "Cannot open file.\n";

return 1;

}

char c;

while (in)

{

in.get(c);

if (in)

outfile.put(c);

in.ignore(1);

}

in.close();

outfile.close();

return 0;

}

char.txt:

nibh in quis justo maecenas rhoncus aliquam lacus morbi quis tortor id nulla ultrices aliquet
vivamus in felis eu sapien cursus vestibulum proin eu mi nulla ac
curabitur convallis duis consequat dui nec nisi volutpat eleifend donec ut dolor morbi
proin risus praesent lectus vestibulum quam sapien varius ut blandit non interdum in ante vestibulum ante
vivamus vel nulla eget eros elementum pellentesque quisque porta volutpat erat quisque erat eros viverraa

charalternate.txt:

nb nqi ut acnsrocsaiumlcsmriqi otri ul lrcsaiutvvmsi ei uspe ussvsiuu ri um ul ccrbtrcnalsdi osqa u e iivlta lieddncu oo ob
ri iu reetlcu etblmqa ainvru tbadtnnitru nat etblmat
iau e ul gteo lmnu elneqeqiqepravlta rtqiqeea rsvvra

Question 3:

Here is code:

#include <iostream>

#include <fstream>

using namespace std;

int main()

{

ifstream in("char.txt");

ofstream outfile("byteswritten.txt");

if (!in)

{

cout << "Cannot open file.\n";

return 1;

}

int offset, bytes;

cout << "Enter offset : ";

cin >> offset;

cout << "Enter number of bytes : ";

cin >> bytes;

in.ignore(offset); // Ignore up to 10 characters or until first space is found.

char c;

int count = 0;

while (in)

{

in.get(c);

if (in)

outfile.put(c);

count++;

if (count >= bytes)

break;

}

in.close();

outfile.close();

return 0;

}

Output:

char.txt:

nibh in quis justo maecenas rhoncus aliquam lacus morbi quis tortor id nulla ultrices aliquet
vivamus in felis eu sapien cursus vestibulum proin eu mi nulla ac
curabitur convallis duis consequat dui nec nisi volutpat eleifend donec ut dolor morbi
proin risus praesent lectus vestibulum quam sapien varius ut blandit non interdum in ante vestibulum ante
vivamus vel nulla eget eros elementum pellentesque quisque porta volutpat erat quisque erat eros viverraa

byteswritten.txt:

in quis ju