fork download
copy 
  1. #include <iostream>
  2. #include <fstream>
  3. #include <sys/time.h>
  4. #include <float.h>
  5.  
  6. using namespace std;
  7.  
  8. struct timeval start_time,end_time;
  9.  
  10. // We shall try results with different N values 
  11. static const int N=100;
  12. // We shall try results with different OFFSET values 
  13. static const int OFFSET=0;
  14.  
  15. //--------------------------------------------------------------------------------------------------------------------------------------------
  16. // template <typename Left, typename Right> 		     // Left and Right might be expressions! 					   
  17. // class sum { 				     // Functor to evaluate left[i]+right[i]
  18.  
  19. // private:
  20. 	// Left myleft;				     // operator[](int) is another standard operator					
  21. 	// Right myright;
  22. // public:
  23. 	// sum(Left l, Right r) : myleft(l), myright(r) {} 
  24.  
  25. 	// int operator[](int i) {return (myleft[i]+myright[i]);}	     // Left and right must also define operator[]
  26.  
  27.  
  28. // }; 		
  29.  
  30. //----------------------------------------------------- 
  31.  
  32. // template <typename T>							
  33.  
  34. 		// T arrayElementAdd(T a, T b) {		
  35.  
  36. 			// return a+b;	
  37. 		// }
  38.  
  39.  
  40. //----------------------------------------------------- 
  41. template<typename T> 
  42. class array {
  43.  
  44. private:
  45. 	T* data;
  46.  
  47. 	int N;
  48.  public:
  49. 	array( T *_data, int _N) : data(_data), N(_N) { } 	// Constructor
  50.  
  51. 	// // template <typename Left,typename Right>       	// Assign the result of sum<left,right>[i] to â??this arrayâ?
  52.  
  53.     // void operator=(T right) {		// Argument is a functor embodying  left+right					
  54. 			// data[i] = right[i];
  55.     // }
  56. 	void operator=(const T& right) {		// Argument is a functor embodying  left+right					
  57. 		for(int i=1; i<=N; i++)
  58. 			data[i] = right[i];
  59.     }
  60.  
  61. 	array operator+(const array& right) {
  62. 		array arr = *this;
  63.  
  64. 		// T *arrmem = new T(N);
  65. 		// array<T> arr(arrmem,N);
  66.  
  67. 		for(int i=1; i<=N; i++)
  68. 			arr[i]=arr[i]+10/*+right[i+OFFSET]*/;	
  69.  
  70. 		return arr;
  71. 	}
  72.  
  73. 	T& operator[](const int i) {return((T&)data[i]);}
  74. }; 
  75.  
  76. //-------------------------------------------------------------
  77.  
  78.  
  79. int main()
  80. {
  81. 	int *amem = new int(N);
  82. 	int *bmem = new int(N);
  83. 	int *cmem = new int(N);
  84.  
  85. 	array<int> a(amem, N);
  86. 	array<int> b(bmem, N);
  87. 	array<int> c(cmem, N);
  88.  
  89.     //Initialization of vectors with values from 1 to 500
  90.     for (int i=1;i<=N;i++)
  91. 	{
  92. 		c[i]=i;
  93. 		b[i]=c[i];
  94. 		a[i]=b[i];
  95.     }
  96.  
  97. 	gettimeofday(&start_time,NULL);
  98. 	// Burada okuduÄ?umuz ilk deÄ?ere bakalım
  99. 	cout<<"\n\ngettimeofday start_time (in seconds)="<<
  100. 		start_time.tv_sec;
  101. 	cout<<"\n\ngettimeofday start_time (in micro secs)="<<
  102. 		start_time.tv_usec;
  103.  
  104. 	a=b+c;
  105.  
  106. 	for (int i=1;i<=N-OFFSET;i++)
  107.     {
  108. 		// // a[i]=b[i]+c[i+OFFSET];
  109. 		// a[i] = arrayElementAdd(b[i], c[i]);
  110. 		cout << "\n" << (int)a[i];
  111.     }
  112.  
  113. 	gettimeofday(&end_time,NULL);
  114. 	// Burada okuduÄ?umuz son deÄ?ere bakalım
  115. 	cout<<"\n\ngettimeofday end_time (in seconds)="<<
  116. 		end_time.tv_sec;
  117. 	cout<<"\n\ngettimeofday end_time (in micro secs)="<<
  118. 		end_time.tv_usec;
  119.  
  120.     //Print the resultant array.
  121.    cout<<"\n\ngettimeofday wall time="<<
  122. 	end_time.tv_sec - start_time.tv_sec+(end_time.tv_usec-start_time.tv_usec)/1e6;
  123.  
  124. }
Success #stdin #stdout 0s 3228KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 

gettimeofday start_time (in seconds)=1432212797

gettimeofday start_time (in micro secs)=897767
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
107
108
109
110

gettimeofday end_time (in seconds)=1432212797

gettimeofday end_time (in micro secs)=897820

gettimeofday wall time=5.3e-05
https://ideone.com/t5OfKQ
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!