#include <stdio.h>

/* count characters in input; 1st version */
main()
{
    long nc;

    nc = 0;
    while (getchar() != EOF)
        ++nc;
    printf("%ldn", nc);
}

#include <stdio.h>

/* count characters in input; 2nd version */
main()
{
    double nc;

    for (nc = 0; getchar() != EOF; ++nc)
        ;
    printf("%.0fn", nc);
}

#include <stdio.h>
#include <stdlib.h>
#include <float.h>

/* count characters in input; SO version */
int main(void)
{
  double total;
  float batch; /* change me to double */

  for (total = 0.0, batch = 0.0; getchar() != EOF; ) {
    float batch_new = batch + 1.0; /* me too */
    if (batch_new - batch != 1.0) {
      total += batch;
      batch = 1.0;
    } else {
      batch = batch_new;
    }
  }

  if (ferror(stdin)) {
    printf("I/O error on standard inputn");
    return EXIT_FAILURE;
  }

  if (total == 0.0)
    printf("%.0f (exact)n", batch);
  else
    printf("%.*g (approx)n", DBL_DIG, total + batch);

  return 0;
}

double