#include <cstdlib>
#include "util.h"

void append_expn(std::string &str, int expn) {
  int k;

  str += (expn < 0 ? '-' : '+');
  expn = std::abs(expn);

  if (expn >= 100) {
    k = (expn / 100);
    str += '0' + k;
    expn -= 100*k;
  }

  k = (expn / 10);
  str += '0' + k;
  expn -= 10*k;

  str += '0' + expn;
}