// writen.cc
// write N bytes of 'x' to file "tmp"

#include <iostream.h>       // cerr
#include <fstream.h>        // ofstream
#include <stdlib.h>         // atoi
#include <assert.h>         // assert
#include <string.h>         // memset

int main(int argc, char *argv[])
{
  if (argc != 2) {
    cerr << "usage: " << argv[0] << " <n>\n"
         << "  where <n> is the # of 'x' bytes to write to file \"tmp\"\n";
    return 2;
  }

  int n = atoi(argv[1]);
  assert(n >= 0);

  // make string of length 'n'
  char *p = new char[n+1];
  memset(p, 'x', n);
  p[n] = 0;

  // write it to a file
  {
    ofstream out("tmp");
    out << p;
  }

  delete[] p;
  return 0;
}