loop project

/******************************************************************************

Welcome to GDB Online.
GDB online is an online compiler and debugger tool for C, C++, Python, Java, PHP, Ruby, Perl,
C#, VB, Swift, Pascal, Fortran, Haskell, Objective-C, Assembly, HTML, CSS, JS, SQLite, Prolog.
Code, Compile, Run and Debug online from anywhere in world.

*******************************************************************************/
#include <stdio.h>
#include <math.h>
#include <time.h>
int nmbr=1;
int t_int =0;
int milliseconds = 500;
double cpu_time_used, process_time;

int main()
{
    
    //time initialization
   clock_t t_1, t_2, t_start, t_end;
   t_start = clock();
   t_1 = 0;
   t_2 = t_1;
 
while (t_int<8)
    
{
t_1 = clock();
 

 
 
 
  ////sleep
  int ms_remaining = milliseconds % 1000;
  long usec = ms_remaining * 1000;
  struct timespec ts_sleep;

  ts_sleep.tv_sec = (milliseconds) / 1000;
  ts_sleep.tv_nsec = 1000*usec;
  nanosleep(&ts_sleep, NULL);
  
  
     

 
 
cpu_time_used = ((double) (t_1 - t_2)); /// CLOCKS_PER_SEC;
printf("Hello World %i, time : %f  \n",nmbr, cpu_time_used);

t_2 = t_1;


nmbr++;
t_int++;


}
   t_end = clock();
process_time = ((double) (t_end - t_start)) / CLOCKS_PER_SEC;
    printf("INTERRUPTED, process time :%f \n", process_time);

}