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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4.  
  5. int compare_ints(const void* a, const void* b)
  6. {
  7.     int arg1 = *(const int*)a;
  8.     int arg2 = *(const int*)b;
  9.  
  10.     if (arg1 < arg2) return -1;
  11.     if (arg1 > arg2) return 1;
  12.     return 0;
  13.  
  14.     // return (arg1 > arg2) - (arg1 < arg2); // possible shortcut
  15.     // return arg1 - arg2; // erroneous shortcut (fails if INT_MIN is present)
  16. }
  17.  
  18.  
  19. int main(void) {
  20. 	enum {N = 3, M = 3};
  21. 	int arr[N][M] = {{1, 6, 7}, {3, 8, 4}, {5, 2, 1}};
  22. 	qsort(arr, N * M, sizeof(int), compare_ints);
  23. 	for (int i = 0; i < N; i++) {
  24. 		for (int j = 0; j < M; j++) {
  25. 	        printf("%d ", arr[i][j]);
  26. 		}
  27. 		printf("\n");
  28.     }
  29. 	return 0;
  30. }
  31.  
Success #stdin #stdout 0s 4708KB
comments (?)
stdin 
Standard input is empty
stdout 
1 1 2 
3 4 5 
6 7 8
https://ideone.com/Uw6sMl
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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