histogram
typedef Histogram; Histogram * histogram_init (); void histogram_free (Histogram *hi); void histogram_add_value (Histogram *hi, double val); void histogram_show (Histogram *hi);
Histogram *hi
double val
typedef struct _histogram Histogram;
Histogram * histogram_init ();
void histogram_free (Histogram *hi);
void histogram_add_value (Histogram *hi, double val);
void histogram_show (Histogram *hi);