Who can help me with c/c++ input / output program .?

We all know strtok. I did not want to explain it here.

This is merely to outline how unpleasant writing

a function is, compared to using boost or stl,

where most programming problems studied

at school are resolved - in one line :O)

#include<iostream>

#include <iterator>

#include <string>

#include <fstream>

using namespace std;

const string strFilename="output.dat";

void output(string strWrite, const string& strSeparator)

{

bool bFlag = false;

char *c_str = strdup(strWrite.c_str());

int iLen = strWrite.length();

for (int i = 0; i < iLen; i++) {

for (int j = 0; j < strSeparator.length(); j++) {

if (c_str[i] == strSeparator[j]) {

j = 0;

if(!bFlag) {

c_str[i++] = '\n';

bFlag = true;

}

else {

strcpy(&c_str[i], &c_str[i + 1]);

--iLen;

if (!iLen) break;

}

}

}

bFlag = false;

}

ofstream os(strFilename);

if (os.is_open()) {

os << c_str << endl;

}

free(c_str);

}

void tok_main()

{

string strSeparator = ":,;. ";

string strInput = "This is a computer. It's a machine. Computer works fast .";

output(strInput, strSeparator);

ifstream is(strFilename);

copy(istream_iterator<string>(is), istream_iterator<string>(), ostream_iterator<string>(cout, "\n"));

}

There is no language called C/C++. Which one do you want to use?

Either way, it's a tokenization problem, solved numerous times by numerous people. Search for "how to tokenize a string in C" or for "how to tokenize a string in C++" and you'll have more solutions to your question than you'll ever need!

To give a working example, I'll use the C++ library boost.tokenizer (from http://www.boost.org,/ although it's available in many development environments out of the box)

#include <iostream>

#include <algorithm>

#include <string>

#include <fstream>

#include <iterator>

#include <boost/tokenizer.hpp>

using namespace std;

using boost::tokenizer;

using boost::char_separator;

int main ()

{

ifstream input("test.txt");

string s;

getline(input,s);

ofstream output("test.out");

tokenizer<char_separator<char> > tok(s, char_separator<char>(" ,;."));

copy(tok.begin(), tok.end(), ostream_iterator<string>(output, "\n"));

}

test run:

~ $ cat test.txt

This is a computer. It's a machine. Computer works fast .

Output :---->

~ $ ./test

~ $ cat test.out

This

is

a

computer

It's

a

machine

Computer

works

fast