A simple run length encoding program.

runlenc.cpp

#include <iostream>

using namespace std;




/// Simple run-length encoding program.
///
/// Example usage:
/// runlenc AAABBAAA
///
/// Result:
/// 3A2B3A
///
int main(int argc, char* argv[])
{
  if (argc != 2)
  {
    cerr << "expected runlenc string" << endl;
    return -1;
  }

  char* c_ptr = argv[1];

  char c = *c_ptr;
  char b = c;
  size_t n = 0;
  while (c)
  {
    if ((b != c) || (n == 9))
    {
      cout << n << b;

      b = c;
      n = 0;
    }
    else
    {
      ++n;
      ++c_ptr;
      c = *c_ptr;
    }
  }
  cout << n << b;

  return 0;
}