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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5.  typedef struct {
  6.    int id;
  7.    char * title;
  8.  } Book;
  9.  
  10.  void freeBooks(Book * v, int num);
  11.  
  12.  void addRecord(Book** v, int *records_num, const Book * b)
  13.  {
  14. 	// Reserve new space and copy
  15.     Book * temp = (Book *) malloc( sizeof(Book) * ( *records_num + 1 ) );
  16.  
  17.     if ( *v != NULL ) {
  18.         memcpy( temp, *v, ( *records_num ) * sizeof( Book ) );
  19.         free( *v );
  20.     }
  21.  
  22.     *v = temp;
  23.  
  24.     // Add new book
  25.     (*v)[ *records_num ].id = b->id;
  26.     (*v)[ *records_num ].title = strdup( b->title );
  27.     ++( *records_num );
  28. }
  29.  
  30. void freeBooks(Book * v, int num)
  31. {
  32. 	int i = 0;
  33.  
  34. 	for(; i < num; ++i) {
  35. 		free( v[ i ].title );
  36. 	}
  37.  
  38. 	free( v );
  39. }
  40.  
  41. void showBooks(Book * v, int num)
  42. {
  43.     int i = 0;
  44.  
  45.     for(; i < num; ++i) {
  46.         printf( "\n%d: '%s'", v[ i ].id, v[ i ].title );
  47.     }
  48.  
  49.     printf( "\n" );
  50.     return;
  51. }
  52.  
  53. int main(void) {
  54. 	Book * books = NULL;
  55. 	Book b1;
  56. 	Book b2;
  57. 	Book b3;
  58. 	int num = 0;
  59.  
  60. 	// Prepare books
  61. 	b1.id = 1;
  62. 	b1.title = "Moby Dick";
  63. 	b2.id = 2;
  64. 	b2.title = "War and peace";
  65. 	b3.id = 3;
  66. 	b3.title = "Anna Karenina";
  67.  
  68. 	// Add them to the vector
  69. 	addRecord( &books, &num, &b1 );
  70. 	addRecord( &books, &num, &b2 );
  71. 	addRecord( &books, &num, &b3 );
  72.  
  73. 	// Show all books
  74. 	showBooks( books, num );
  75.  
  76.     // Finish
  77. 	freeBooks( books, num );
  78. 	return 0;
  79. }
  80.  
Success #stdin #stdout 0s 2184KB
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Standard input is empty
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1: 'Moby Dick'
2: 'War and peace'
3: 'Anna Karenina'
https://ideone.com/mQQeKi
C Dynamic array
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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