How to calculate compilation time using c?

Applications Programming
1

is there function with library "time.h" to calculate the processing time of the code?

2

As in, can you find out inside the code itself how long the same code to compile?

Or do you just want to time shell commands like cc externally?

3

no, i just want to measure the performance of my code "using c"

so i want how much time it take to process my code
i used that

#include <time.h>
     
     clock_t start, end;
     double cpu_time_used;
     
     start = clock();
     ... /* Do the work. */
     end = clock();
     cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;

it was so weird since i printed cpu_time_used
like that

printf(cpu_time_used)

it gave me error

printf("%f",cpu_time_used)

gave me 0.0000000000 which is wrong

printf("%i",cpu_time_used)

gave me 176543867 which is integer that print double make no since O.o

4

%i and %d mean integer, float or double would be %f.

I usually use this code:

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

/* returns a timestamp in microseconds */
int64_t micro(void)
{
	int64_t val;
	struct timeval tv;
	gettimeofday(&tv, NULL);
	val=tv.tv_sec;
	val*=1000000;
	val+=tv.tv_usec;
	return(val);
}
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