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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. typedef struct {
  6. 	char *name;
  7. 	float start_time;
  8. } subject_t;
  9.  
  10. subject_t *subject_init(const char *name, float start_time) {
  11. 	subject_t *s = malloc(sizeof(subject_t));
  12. 	s->name = strdup(name);
  13. 	s->start_time = start_time;
  14. 	return s;
  15. }
  16.  
  17. /* funkcja porownujaca */
  18. int cmp_subject(const void *a, const void *b) {
  19. 	subject_t *aa = *(subject_t**)a;
  20. 	subject_t *bb = *(subject_t**)b;
  21. 	float as = aa->start_time;
  22. 	float ab = bb->start_time;
  23. 	return (as > ab) - (as < ab);
  24. }
  25.  
  26. void subject_print(const subject_t *s) {
  27. 	printf("%s begins at %.2f\n",s->name,s->start_time);
  28. }
  29.  
  30. void subject_free(subject_t *s) {
  31. 	free(s->name);
  32. 	free(s);
  33. }
  34.  
  35. int main(void) {
  36. 	size_t i, nof_subjects = 6;
  37.  
  38. 	/* tablica
  39. 	 * alokujemy pamiec dla nof_subjects przedmiotow */
  40. 	subject_t **subjects = malloc(nof_subjects * sizeof(subject_t*));
  41.  
  42. 	printf("[Nazwa przedmiotu] [Godzina rozpoczecia]\n");
  43. 	/* wpisujemy kazdy przedmiot */
  44. 	for(i=0;i<nof_subjects;++i) {
  45. 		char input[32];
  46. 		float start_time;
  47. 		scanf("%31s",&input);
  48. 		scanf("%f",&start_time);
  49. 		subjects[i] = subject_init(input,start_time);
  50. 	}
  51.  
  52. 	/* sortujemy tablice przedmiotow */
  53. 	qsort(subjects,nof_subjects,sizeof(subject_t*),cmp_subject);
  54.  
  55. 	/* wypisujemy posortowane przedmioty z tablicy */
  56. 	for(i=0;i<nof_subjects;++i)
  57. 		subject_print(subjects[i]);
  58.  
  59. 	/* zwalniamy po sobie pamiec */
  60. 	while(nof_subjects--)
  61. 		subject_free(subjects[nof_subjects]);
  62. 	free(subjects);
  63.  
  64. 	return 0;
  65. }
  66.  
Success #stdin #stdout 0s 2428KB
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stdin
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Matematyka 9.50
WF 8.00
Angielski 10.30
Fizyka 13.30
Historia 11.20
Chemia 12.30
stdout
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[Nazwa przedmiotu] [Godzina rozpoczecia]
WF begins at 8.00
Matematyka begins at 9.50
Angielski begins at 10.30
Historia begins at 11.20
Chemia begins at 12.30
Fizyka begins at 13.30
https://ideone.com/3rZeIn
language:
C (gcc 8.3)
created:
10 years ago
visibility:
secret

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