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  1. #include <iostream>
  2. #include <stdio.h>
  3. #include <chrono>
  4. #include <cstring>
  5. using namespace std;
  6.  
  7.  
  8. unsigned int strcpylen(char dest[], const char source[]) {
  9.     unsigned int i = 0;
  10.     while ((dest[i] = source[i]) != '\0') {
  11.        i++;
  12.     }
  13.     return i; 
  14. }
  15.  
  16.  
  17. int main(int argc, char** argv) {
  18. 	char str1[20];
  19. 	scanf("%s", str1);
  20.  
  21. 	char str2[20];
  22.  
  23.  
  24. 	auto start = chrono::steady_clock::now();
  25.  
  26. 	for (int i = 0; i < 10000; ++i) {
  27.  
  28. 		volatile int len = strcpylen(str2, str1);
  29. 	}
  30.  
  31. 	auto end = chrono::steady_clock::now();
  32.  
  33.     auto diff = end - start;
  34.  
  35. 	cout << "part1: " << chrono::duration <double, nano> (diff).count() << endl;
  36.  
  37. 	start = chrono::steady_clock::now();
  38.  
  39. 	for (int i = 0; i < 10000; ++i) {
  40.  
  41. 		volatile int len; 
  42. 		strcpy(str2, str1);
  43. 		len  = strlen(str2);
  44. 	}
  45.  
  46. 	end = chrono::steady_clock::now();
  47.  
  48.     diff = end - start;
  49.  
  50. 	cout << "part2: " << chrono::duration <double, nano> (diff).count() << endl;
  51. 	// your code goes here
  52. 	return 0;
  53. }
Success #stdin #stdout 0s 3472KB
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part1: 33858
part2: 63196
https://ideone.com/arie8e
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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