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msestak2 on 11/10/12

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Lista_pokazivaci.h


/ Published in: C++
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U ovoj biblioteci su definirane funkcije za izvršavanje operacija nad ATP listom: iniciranje prazne liste(InitL), funkcije koje vraćaju pozicije prvog i zadnjeg elementa(FirstL i EndL), funkcija za umetanje elementa(InsertL), funkcija koja vraća vrijednost elementa na nekoj poziciji(RetrieveL) te funkcije za brisanje pojedinog elementa(DeleteL) ili cijele liste(DeleteAllL).


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  1. struct elementtype{
  2. int sifra;
  3. char naziv[30];
  4. char vrsta[30];
  5. float cijena;
  6. struct{
  7. int dan, mjesec, godina;
  8. }datum_dostave;
  9. };
  10.  
  11. struct lis {
  12. elementtype value;
  13. lis *next;
  14. };
  15.  
  16. typedef lis *element;
  17. typedef lis list;
  18.  
  19. void DeleteAllL(list* L){
  20. while(L->next){
  21. element toDelete = L->next;
  22. if(L->next){
  23. L->next = toDelete->next;
  24. delete toDelete;
  25. }
  26. }
  27. delete L;
  28. L = NULL;
  29. }
  30.  
  31.  
  32. list* InitL(list* L){
  33. if(L!=NULL)
  34. DeleteAllL(L);
  35. else{
  36. list *newList = new list;
  37. newList->next = NULL;
  38. return newList;
  39. }
  40. return NULL;
  41. }
  42.  
  43. element FirstL(list* L){
  44. return L;
  45. }
  46.  
  47. element EndL(list* L){
  48. element current = L;
  49. while(current->next){
  50. current = current->next;
  51. }
  52. return current;
  53. }
  54.  
  55. element NextL(element p, list *L){
  56. if(p!=NULL){
  57. if(p==EndL(L)){
  58. return NULL;
  59. }
  60. return p->next;
  61. }
  62. return EndL(L);
  63. }
  64.  
  65. element PreviousL(element p, list *L){
  66. element current = L;
  67. while(current){
  68. if(current->next == p )
  69. return current;
  70. current = current->next;
  71. }
  72. return NULL;
  73. }
  74.  
  75. element LocateL(elementtype el, list* L){
  76. element current = L;
  77. while(current->next){
  78. if(current->next->value.sifra == el.sifra)
  79. return current;
  80. current = current->next;
  81. }
  82. return NULL;
  83. }
  84.  
  85. void InsertL(elementtype el, element p, list* L){
  86. if(p==NULL)
  87. return;
  88. else{
  89. element novi = new lis;
  90. novi->value = el;
  91. novi->next = p->next;
  92. p->next = novi;
  93. }
  94. }
  95.  
  96. void DeleteL(element p, list* L){
  97. element toDelete = p->next;
  98. if(toDelete){
  99. p->next = toDelete->next;
  100. delete toDelete;
  101. }
  102. }
  103.  
  104. elementtype RetrieveL(element p, list* L){
  105. return p->next->value;
  106. }

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