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  1. // $ gcc -std=c99 -Wall -Wextra -pedantic *.c && time ./a.out
  2. #include <stdint.h> // uintmax_t
  3. #include <stdio.h>
  4. #include <stdlib.h> // system()
  5. #include <time.h>
  6. #include <unistd.h> // sleep()
  7.  
  8. static double double_clock() {
  9.   return clock() / (double) CLOCKS_PER_SEC;
  10. }
  11.  
  12. int main(int argc, char* argv[]) {
  13.   double start = double_clock();
  14.   sleep(1);
  15.   printf("after sleep %.2g\n", double_clock() - start);
  16.  
  17.   start = double_clock();
  18.   system("sleep 1");
  19.   printf("after sleep %.2g\n", double_clock() - start);
  20.  
  21.   start = double_clock();
  22.   int n = (argc == 2) ? atoi(argv[argc-1]) : 500000000;
  23.   uintmax_t s = 0;
  24.   for (int i = 0; i < n; ++i)
  25.     s += i;
  26.   if (s != (uintmax_t)(n-1)*(n/2)) return 1;
  27.   printf("after loop %.2g\n", double_clock() - start);
  28.  
  29.   return 0;
  30. }
Success #stdin #stdout 2.01s 3720KB
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Standard input is empty
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after sleep -2.1e-19
after sleep -2.1e-19
after loop 2
https://ideone.com/iEjgi
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
secret

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