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Showing content from https://en.cppreference.com/w/cpp/language/../../cpp/../cpp/../cpp/../cpp/../c/chrono/clock_t.html below:

clock_t - cppreference.com

typedef /* unspecified */ clock_t;

Arithmetic(until C11)Real(since C11) type capable of representing the processor time used by a process. It has implementation-defined range and precision.

#include <stdio.h>
#include <time.h>
#include <math.h>
 
volatile double sink;
int main (void)
{
  clock_t start = clock();
 
  for(size_t i=0; i<3141592; ++i)
      sink+=sin(i);
 
  clock_t end = clock();
  double cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;
 
  printf("for loop took %f seconds to execute \n", cpu_time_used);
}

Possible output:

for loop took 0.271828 seconds to execute

• C17 standard (ISO/IEC 9899:2018):

• 7.27.1/3 Components of time (p: 284)

• C11 standard (ISO/IEC 9899:2011):

• 7.27.1/3 Components of time (p: 388)

• C99 standard (ISO/IEC 9899:1999):

• 7.23.1/3 Components of time (p: 338)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.12.1 Components of time

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