#include <stdio.h>

int main ()
{
    double a = 1234.56789;
    double b = 299792458;
    double c = 6.62607e-34;

    /* Default printing. */

    printf ("Using %%f (fixed point): %f %f %f.\n", a, b, c);
    printf ("Using %%e (force exponent): %e %e %e.\n", a, b, c);
    printf ("Using %%g (best fit): %g %g %g.\n", a, b, c);

    /* With a width. */

    printf ("Using %%15f: %15f %15f %15f.\n", a, b, c);
    printf ("Using %%15e: %15e %15e %15e.\n", a, b, c);
    printf ("Using %%15g: %15g %15g %15g.\n", a, b, c);

    /* With a width and precision. */

    /* This forces three decimal places. */

    printf ("Using %%15.3f: %15.3f %15.3f %15.3f.\n", a, b, c);

    /* This forces three decimal places of mantissa. */

    printf ("Using %%15.3e: %15.3e %15.3e %15.3e.\n", a, b, c);

    /* This forces two decimal places of mantissa. */

    printf ("Using %%15.3g: %15.3g %15.3g %15.3g.\n", a, b, c);

    /* Let's go crazy. */

    printf ("Using %%15.10f: %15.10f %15.10f %15.10f.\n", a, b, c);
    printf ("Using %%15.10e: %15.10e %15.10e %15.10e.\n", a, b, c);

    /* %g doesn't print trailing zeroes. */

    printf ("Using %%15.10g: %15.10g %15.10g %15.10g.\n", a, b, c);

    return 0;
}