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  1. #include <stdio.h>      /* printf, scanf, NULL */
  2. #include <stdlib.h>     /* calloc, exit, free */
  3. #include <time.h>       /* clock_t, clock, CLOCKS_PER_SEC */
  4.  
  5. const size_t c_array_size = 10000000;
  6.  
  7. /* Fields */
  8. enum T_field_enum { amount_of_money_e, gender_e, age_e, code_e, height_e,   /*<<<<<- add fields here */    last_e };
  9.  
  10. /* Row */
  11. struct T_cash_account_row {
  12.     unsigned code:20;			// 0 - 1000000
  13. 	unsigned gender:1;			// 0 - 1
  14. 	unsigned age:7;			    // 0 - 100	
  15. 	unsigned amount_of_money:20;// 0 - 1000000
  16. 	unsigned height:9;			// 0 – 300
  17. };
  18. /* ----------------------------------------------------------------------- */
  19.  
  20. /* Generate random data for the one row */
  21. static inline struct T_cash_account_row generate_row() {
  22. 	struct T_cash_account_row cash_account_row;
  23. 	cash_account_row.age = rand() % 100;
  24. 	cash_account_row.amount_of_money = (rand() % 1000)*(rand() % 1000);
  25. 	cash_account_row.code = (rand() % 1000)*(rand() % 1000);
  26. 	cash_account_row.gender = rand() % 2;
  27. 	cash_account_row.height = rand() % 300;
  28. 	return cash_account_row;
  29. }
  30. /* ----------------------------------------------------------------------- */
  31.  
  32. /* Filters */
  33. struct T_range_filters {
  34.     struct T_cash_account_row begin, end;
  35.     /* bytes array or bitset from https://g...content-available-to-author-only...b.com/jmbr/667605 */
  36.     unsigned char use_filter[last_e]; 
  37. };
  38. /* ----------------------------------------------------------------------- */
  39.  
  40. /* Compare row with filters */
  41. static inline unsigned char test_predicate(struct T_cash_account_row const*const row, 
  42.     struct T_range_filters const*const range_filters) 
  43. {    
  44.     return 
  45.         (!range_filters->use_filter[amount_of_money_e] || 
  46.             (row->amount_of_money >= range_filters->begin.amount_of_money &&
  47.             row->amount_of_money <= range_filters->end.amount_of_money)) &&
  48.         (!range_filters->use_filter[gender_e] || 
  49.             (row->gender >= range_filters->begin.gender && row->gender <= range_filters->end.gender)) &&
  50.         (!range_filters->use_filter[age_e] || 
  51.             (row->age >= range_filters->begin.age && row->age <= range_filters->end.age)) &&
  52.         (!range_filters->use_filter[code_e] || 
  53.             (row->code >= range_filters->begin.code && row->code <= range_filters->end.code)) &&
  54.         (!range_filters->use_filter[height_e] || 
  55.             (row->height >= range_filters->begin.height && row->height <= range_filters->end.height));
  56. }
  57. /* ----------------------------------------------------------------------- */
  58.  
  59. /* search */
  60. static inline size_t search(struct T_cash_account_row const*const array_ptr, const size_t c_array_size,
  61. 	struct T_cash_account_row *const result_ptr, struct T_range_filters const*const range_filters) 
  62. {
  63. 	size_t result_size = 0;
  64. 	size_t i; /* loop index */
  65. 	for(i = 0; i < c_array_size; ++i) {
  66. 		if(test_predicate(array_ptr + i, range_filters)) 
  67. 			result_ptr[result_size] = array_ptr[i], ++result_size;
  68. 	}
  69. 	return result_size; 
  70. }
  71. /* ----------------------------------------------------------------------- */
  72.  
  73. int main() {
  74.  
  75. 	size_t i; /* loop index */
  76.     struct T_cash_account_row *const array_ptr = ( struct T_cash_account_row *)calloc(c_array_size, sizeof(struct T_cash_account_row));
  77.     if (array_ptr == NULL) {
  78. 		printf ("calloc error\n");
  79. 		exit(1);
  80. 	}
  81.  
  82. 	/* initialize random seed: */
  83. 	/* srand (time(NULL)); */
  84.  
  85. 	/* Fill table random data */
  86. 	for(i = 0; i < c_array_size; ++i) 
  87. 		array_ptr[i] = generate_row();
  88. 	printf ("Generated rows: %d \n", c_array_size);
  89.  
  90.     struct T_range_filters range_filters = {};
  91.  
  92. 	range_filters.use_filter[amount_of_money_e] = rand()%1 + 0;
  93. 	range_filters.use_filter[gender_e] = rand()%1 + 0;
  94. 	range_filters.use_filter[height_e] = rand()%1 + 0;
  95.  
  96.     range_filters.begin.age = rand() % 100;
  97.     range_filters.end.age = range_filters.begin.age + 5;
  98.     range_filters.use_filter[age_e] = rand()%1 + 1;
  99.  
  100.     range_filters.begin.code = rand() % 30000;
  101.     range_filters.end.code = range_filters.begin.code + 5;
  102.     range_filters.use_filter[code_e] = rand()%1 + 1;
  103.  
  104.     struct T_cash_account_row *const result_ptr = ( struct T_cash_account_row *)calloc(c_array_size, sizeof(struct T_cash_account_row));
  105.  
  106. 	size_t result_size;
  107. 	clock_t end, start;
  108.  
  109. 	printf ("C-Searching...\n");
  110.  
  111. 	start = clock();
  112. 	result_size = search(array_ptr, c_array_size, result_ptr, &range_filters);
  113. 	end = clock();
  114. 	float c_took_time = (float)(end - start);
  115. 	printf ("C-search took %f seconds.\n", c_took_time/CLOCKS_PER_SEC);
  116.  
  117. 	printf ("Found rows: %d \n", result_size);
  118.  
  119. 	/*for(i = 0; i < result_size; ++i) {
  120. 		printf ("%d, %d, %d, %d, %d \n", 
  121. 			result_ptr[i].age, result_ptr[i].amount_of_money, result_ptr[i].code, result_ptr[i].gender, result_ptr[i].height);
  122. 	}*/
  123.  
  124.     int qwerty;
  125.     scanf ("%d",&qwerty);
  126.     return 0;
  127. }
Success #stdin #stdout 1.94s 158080KB
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stdin
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Standard input is empty
stdout
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Generated rows: 10000000 
C-Searching...
C-search took 0.040000 seconds.
Found rows: 38
https://ideone.com/yfUYfk
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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