String^ input = ::copies("The quick brown fox jumps over the lazy dog. ", 10);
String^ sep = " "; String^ prefix = "> ";

String^ wrapped = textwrap(input, 74 - prefix->Length, sep, prefix);
Console::WriteLine("{0}", wrapped);

using namespace System;
using namespace System::Text;

String^ copies(String^ text, int n);
String^ textwrap(String^ text, int maxWidth, String^ sep = " ", String^ prefix = "");

int main()
{
String^ input = ::copies("The quick brown fox jumps over the lazy dog. ", 10);
String^ sep = " "; String^ prefix = "> ";

String^ wrapped = textwrap(input, 74 - prefix->Length, sep, prefix);
Console::WriteLine("{0}", wrapped);
}

String^ copies(String^ text, int n)
{
int minlen = n * text->Length; StringBuilder^ sb = gcnew StringBuilder(minlen + (8 - minlen % 8));
for (int i = 0; i < n; ++i) sb->Append(text);
return sb->ToString();
}

String^ textwrap(String^ text, int maxWidth, String^ sep, String^ prefix)
{
int seplen = sep->Length, textlen = text->Length, widx = 0, wbegin = 0, wlen = 0, wcumlen = 0;

StringBuilder^ Line = gcnew StringBuilder(textlen + (8 - textlen % 8)); Line->Append(prefix);

while ((widx = text->IndexOf(sep, wbegin)) != -1)
{
wlen = widx - wbegin; wcumlen += (wlen + seplen);

if (wcumlen < maxWidth)
{
Line->Append(text->Substring(wbegin, wlen))->Append(sep);
}
else
{
Line->Append("\n")->Append(prefix)->Append(text->Substring(wbegin, wlen))->Append(sep); wcumlen = 0;
}

wbegin = widx + seplen;
}

return Line->ToString();
}

void rep(ostream &os, const string& str, int times)
{
while (times--)
os << str;
}

void wrap(ostream &os, const string& str, const string &prefix, int width)
{
int line_len = width;
bool first_word = true;

width -= prefix.size();
BOOST_FOREACH(string word, tokenizer<char_separator<char>>(str, char_separator<char>(" ")))
{
line_len += word.size();
if (line_len++ < width)
os << ' ';
else {
if (first_word)
first_word = false;
else
os << endl;
os << prefix;
line_len = word.size();
}
os << word;
}
os << endl;
}

int main()
{
stringstream input;

rep(input, "The quick brown fox jumps over the lazy dog. ", 10);
wrap(cout, input.str(), "> ", 72);
}

#include <iostream>
#include <sstream>
#include <string>

#include <boost/tokenizer.hpp>
#include <boost/foreach.hpp>

using namespace std;
using namespace boost;

void rep(ostream &os, const string& str, int times)
{
while (times--)
os << str;
}

void wrap(ostream &os, const string& str, const string &prefix, int width)
{
int line_len = width;
bool first_word = true;

width -= prefix.size();
BOOST_FOREACH(string word, tokenizer<char_separator<char>>(str, char_separator<char>(" ")))
{
line_len += word.size();
if (line_len++ < width)
os << ' ';
else {
if (first_word)
first_word = false;
else
os << endl;
os << prefix;
line_len = word.size();
}
os << word;
}
os << endl;
}

int main()
{
stringstream input;

rep(input, "The quick brown fox jumps over the lazy dog. ", 10);
wrap(cout, input.str(), "> ", 72);
}