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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct Stack {
  5.     int capacity;
  6.     int index;
  7.     int *data;
  8. };
  9.  
  10. struct Stack * CreateStacks(int numberOfStacks)
  11. {
  12. 	// Should always check return from malloc for NULL...
  13. 	struct Stack *stack = malloc(numberOfStacks * sizeof(struct Stack));
  14. 	for (int i = 0; i < numberOfStacks; i++) {
  15. 		stack[i].capacity = 10;
  16. 		stack[i].index = 0;
  17. 		stack[i].data = malloc(10 * sizeof(int));
  18. 	}
  19. 	return stack;
  20. }
  21.  
  22. void FreeStacks(struct Stack *stack, int numberOfStacks)
  23. {
  24. 	for (int i = 0; i < numberOfStacks; i++) {
  25. 		free(stack[i].data);
  26. 	}
  27. 	free(stack);
  28. }
  29.  
  30. void Push(struct Stack *stack, int value) {
  31.     // Check for reallocation
  32.     if (stack->index == stack->capacity) {
  33.         stack->capacity *= 2;  //Assumes capacity >= 1
  34.         stack->data = realloc(stack->data, sizeof(int) * stack->capacity);
  35.     }
  36.     // Set the data
  37.     stack->data[stack->index++] = value;
  38. }
  39.  
  40. int Pop(struct Stack *stack)
  41. {
  42. 	if (stack->index < 0) return 0; // Error
  43. 	return stack->data[--stack->index];
  44. }
  45.  
  46. int main(void) {
  47. 	struct Stack *pml = CreateStacks(100);
  48. 	// Assign some values to first stack
  49. 	for (int i = 0; i < 25; i++) {
  50. 		Push(&pml[0], i);
  51. 	}
  52. 	// Print values
  53. 	for (int i = 0; i < 25; i++) {
  54. 		printf("%d ", Pop(&pml[0]));
  55. 	}
  56.  
  57. 	FreeStacks(pml, 100);
  58. 	return 0;
  59. }
  60.  
Success #stdin #stdout 0s 2292KB
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24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
https://ideone.com/mcbP5P
language:
C (gcc 8.3)
created:
10 years ago
visibility:
secret

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