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  1. // C program to read Student records 
  2. // like id, name and age, 
  3. // and display them in sorted order by Name 
  4.  
  5. #include <stdio.h> 
  6. #include <stdlib.h> 
  7. #include <string.h> 
  8.  
  9. // struct person with 3 fields 
  10. struct Student { 
  11. 	char* name; 
  12. 	int id; 
  13. 	char age; 
  14. }; 
  15.  
  16. // setting up rules for comparison 
  17. // to sort the students based on names 
  18. int comparator(const void* p0, const void* p1) 
  19. { 
  20. 	struct Student* ps0 = *(struct Student**) p0;
  21.         struct Student* ps1 = *(struct Student**) p1;
  22.         return strcmp( ps0->name, ps1->name);
  23. } 
  24.  
  25. // Driver program 
  26. int main() 
  27. { 
  28. 	int i = 0, n = 5; 
  29.  
  30. 	struct Student * arr = (struct Student *)malloc(n * sizeof(struct Student)); 
  31. 	// Get the students data 
  32. 	arr[0].id = 1; 
  33. 	arr[0].name = "bd"; 
  34. 	arr[0].age = 12; 
  35.  
  36. 	arr[1].id = 2; 
  37. 	arr[1].name = "ba"; 
  38. 	arr[1].age = 10; 
  39.  
  40. 	arr[2].id = 3; 
  41. 	arr[2].name = "bc"; 
  42. 	arr[2].age = 8; 
  43.  
  44. 	arr[3].id = 4; 
  45. 	arr[3].name = "aaz"; 
  46. 	arr[3].age = 9; 
  47.  
  48. 	arr[4].id = 5; 
  49. 	arr[4].name = "az"; 
  50. 	arr[4].age = 10; 
  51.  
  52. 	// Print the Unsorted Structure 
  53. 	printf("Unsorted Student Records:\n"); 
  54. 	for (i = 0; i < n; i++) { 
  55. 		printf("Id = %d, Name = %s, Age = %d \n", 
  56. 			arr[i].id, arr[i].name, arr[i].age); 
  57. 	} 
  58. 	// Sort the structure 
  59. 	// based on the specified comparator 
  60. 	qsort(arr, n, sizeof(struct Student *),comparator);
  61.  
  62. 	// Print the Sorted Structure 
  63. 	printf("\n\nStudent Records sorted by Name:\n"); 
  64. 	for (i = 0; i < n; i++) { 
  65. 		printf("Id = %d, Name = %s, Age = %d \n", 
  66. 			arr[i].id, arr[i].name, arr[i].age); 
  67. 	} 
  68.  
  69. 	return 0; 
  70. } 
  71.  
Runtime error #stdin #stdout 0s 4296KB
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https://ideone.com/qx9jCy
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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