this, C (gcc) - rextester

this

#include <stdio.h>
#include <time.h>
#include <math.h>
//#define	maxitr 500000000

/*ELE709 Lab 2.*/

int main()
{
   int i, maxitr = 500000000;
   double a, b, c;
   char op;
  
   struct timespec start_time, stop_time, res;
   double tmp;
  
  do{
   
   printf("Welcome to the Experiment.\n");
   
   printf("Please enter the first value: \n");
   scanf("%lf",&a);
   
   printf("Please enter the operation: \n");
   scanf("%c",&op);
   
   printf("Please enter the second value: \n");
   scanf("%lf",&b);
   
  
   clock_getres(CLOCK_REALTIME, &res);

clock_gettime(CLOCK_REALTIME, &start_time);
  
  
  
	
	if(op == '+'){
			for(i = 0; i < maxitr; i++)
			{
				c = a + b;
			}
		printf("The sum is: %lf\n", c);
		}
		
		else if (op == '-'){
			for(i = 0; i < maxitr; i++)
			{
				c = a - b;
			}
			printf("The difference is: %lf\n", c);
		}
	
		else if (op == '/')
			{
			for(i = 0; i < maxitr; i++)
			{
				c = a / b;
			}
			printf("The resultant is: %lf\n", c);
		}
		
		else if (op == '*')
			{
			for(i = 0; i < maxitr; i++)
			{
				c = a * b;
			}
			printf("The product is: %lf\n", c);
		}
		
		else
	{
		 printf("Invalid input.\n");	
	}
	
	clock_gettime(CLOCK_REALTIME, &stop_time);
	tmp = (stop_time.tv_nsec-start_time.tv_nsec);///maxitr;
	
	printf("The operation took an average time of %lf ns long to complete.", (tmp/maxitr));

/* sleep_time.tv_sec = 0;
   sleep_time.tv_nsec = 20000000;
   printf("Sleep time requested is %ld sec  %ld nsec\n",
         sleep_time.tv_sec, sleep_time.tv_nsec);

itr = 10;
   for(i = 0; i < itr; i++)
   {
      clock_gettime(CLOCK_REALTIME, &start_time);
      nanosleep(&sleep_time,NULL);
      clock_gettime(CLOCK_REALTIME, &stop_time);

tmp = (stop_time.tv_sec - start_time.tv_sec)*1e9;
      tmp  += (stop_time.tv_nsec - start_time.tv_nsec);
      elapsed_time[i] = tmp;
   }

for(i = 0; i < itr; i++)
   {
      printf("Iteration %2d ... Slept for %lf nsec\n", i, elapsed_time[i]);
	}*/

return 0;
}while (NULL);
}


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