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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() {
  18.  
  19. 	const char *str1 = "balls!";
  20. 	char str2[20];
  21.  
  22.  
  23. 	auto start = chrono::steady_clock::now();
  24.  
  25. 	for (int i = 0; i < 10000; ++i) {
  26.  
  27. 		volatile int len = strcpylen(str2, str1);
  28. 	}
  29.  
  30. 	auto end = chrono::steady_clock::now();
  31.  
  32.     auto diff = end - start;
  33.  
  34. 	cout << "part1: " << chrono::duration <double, nano> (diff).count() << endl;
  35.  
  36. 	start = chrono::steady_clock::now();
  37.  
  38. 	for (int i = 0; i < 10000; ++i) {
  39.  
  40. 		volatile int len; 
  41. 		strcpy(str2, str1);
  42. 		len  = strlen(str2);
  43. 	}
  44.  
  45. 	end = chrono::steady_clock::now();
  46.  
  47.     diff = end - start;
  48.  
  49. 	cout << "part2: " << chrono::duration <double, nano> (diff).count() << endl;
  50. 	// your code goes here
  51. 	start = chrono::steady_clock::now();
  52.  
  53. 	for (int i = 0; i < 10000; ++i) {
  54.  
  55. 		volatile int len = strlen(str1);
  56. 		memcpy(str2, str1,len+1);
  57. 	}
  58.  
  59. 	end = chrono::steady_clock::now();
  60.  
  61.     diff = end - start;
  62.  
  63. 	cout << "part3: " << chrono::duration <double, nano> (diff).count() << endl;
  64. 	return 0;
  65. }
Success #stdin #stdout 0s 3460KB
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Standard input is empty
stdout
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part1: 182462
part2: 27825
part3: 420783
https://ideone.com/HH7ZxI
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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