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  1. #include <time.h>
  2.     #include <sys/time.h>
  3.     #include <stdlib.h>
  4.     #include <stdio.h>
  5.     #include <math.h>
  6.     #include <cctype>
  7.     #include <algorithm>
  8.  
  9.     /* Return 1 if the difference is negative, otherwise 0.  */
  10.     int timeval_subtract(struct timeval *result, struct timeval *t2, struct timeval *t1)
  11.     {
  12.     	long int diff = (t2->tv_usec + 1000000 * t2->tv_sec) - (t1->tv_usec + 1000000 * t1->tv_sec);
  13.     	result->tv_sec = diff / 1000000;
  14.     	result->tv_usec = diff % 1000000;
  15.  
  16.     	return (diff<0);
  17.     }
  18.  
  19.     void timeval_print(struct timeval *tv)
  20.     {
  21.     	char buffer[30];
  22.     	time_t curtime;
  23.  
  24.     	printf("%ld.%06ld", tv->tv_sec, tv->tv_usec);
  25.     	curtime = tv->tv_sec;
  26.     	strftime(buffer, 30, "%m-%d-%Y  %T", localtime(&curtime));
  27.     	printf(" = %s.%06ld\n", buffer, tv->tv_usec);
  28.     }
  29.  
  30.     int main()
  31.     {
  32.     	struct timeval tvBegin, tvEnd, tvDiff;
  33.  
  34.     	// begin
  35.     	gettimeofday(&tvBegin, NULL);
  36.     	timeval_print(&tvBegin);
  37.  
  38.         static char str1[100] = "str,, ing";
  39.         size_t size = sizeof(str1)/sizeof(str1[0]);
  40.  
  41.     	// lengthy operation
  42.     	int i,j;
  43.     	for(i=0;i<999999L;++i) {
  44.             int bad = 0;
  45.             int cur = 0;
  46.             while (str1[cur] != '\0') {
  47.                 if (bad < cur && !ispunct(str1[cur]) && !isspace(str1[cur])) {
  48.                     str1[bad] = str1[cur];
  49.                 }
  50.                 if (ispunct(str1[cur]) || isspace(str1[cur])) {
  51.                     cur++;
  52.                 }
  53.                 else {
  54.                     cur++;
  55.                     bad++;
  56.                 }
  57.             }
  58.             str1[bad] = '\0';
  59.     	}
  60.  
  61.     	//end
  62.     	gettimeofday(&tvEnd, NULL);
  63.     	timeval_print(&tvEnd);
  64.  
  65.     	// diff
  66.     	timeval_subtract(&tvDiff, &tvEnd, &tvBegin);
  67.     	printf("%ld.%06ld\n", tvDiff.tv_sec, tvDiff.tv_usec);
  68.  
  69.     	return 0;
  70.     }
  71.  
Success #stdin #stdout 0.1s 2860KB
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1392335645.961366 = 02-13-2014  23:54:05.961366
1392335646.068226 = 02-13-2014  23:54:06.068226
0.106860
https://ideone.com/GEjP9W
language:
C++ 4.3.2 (gcc-4.3.2)
created:
10 years ago
visibility:
public

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