#include <time.h>

typedef struct{
    int running;        /* boolean */
    double last_time;
    double total;

} *Stopwatch, Stopwatch_struct;



double seconds();

void Stopwtach_reset(Stopwatch Q);

Stopwatch new_Stopwatch(void);
void Stopwatch_delete(Stopwatch S);
void Stopwatch_start(Stopwatch Q);
void Stopwatch_resume(Stopwatch Q);
void Stopwatch_stop(Stopwatch Q);
double Stopwatch_read(Stopwatch Q);