#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>

void get_usage_info(struct rusage **info); 
float user_time_info(struct rusage *info1, struct rusage *info2);
float system_time_info(struct rusage *info1, struct rusage *info2);
void print_usage_info(struct rusage *info1, struct rusage *info2);