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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 		int a[4];
  5. 	int *b = malloc(16);
  6. 	int *c;
  7. 	int i;
  8.  
  9. 	printf("1: a = %p, b = %p, c = %p\n", a, b, c);
  10.  
  11. 	c = a;
  12. 	for (i = 0; i < 4; i++)
  13. 		a[i] = 100 + i;
  14. 	c[0] = 200;
  15.  
  16. 	// 200, 101, 102, 103
  17. 	printf("2: a[0] = %d, a[1] = %d, a[2] = %d, a[3] = %d\n",
  18. 			a[0], a[1], a[2], a[3]);
  19.  
  20. 	c[1] = 300;
  21. 	*(c + 2) = 301;
  22. 	3[c] = 302;
  23.  
  24. 	// 200, 300, 301, 302
  25. 	printf("3: a[0] = %d, a[1] = %d, a[2] = %d, a[3] = %d\n",
  26. 			a[0], a[1], a[2], a[3]);
  27.  
  28. 	c = c + 1;
  29. 	*c = 400;
  30.  
  31. 	// 200, 400, 301, 302
  32. 	printf("4: a[0] = %d, a[1] = %d, a[2] = %d, a[3] = %d\n",
  33. 			a[0], a[1], a[2], a[3]);
  34.  
  35. 	c = (int *) ((char *) c + 1);
  36. 	*c = 500;
  37.  
  38. 	// 200, 128114, 256, 302 ......??
  39. 	printf("5: a[0] = %d, a[1] = %d, a[2] = %d, a[3] = %d\n",
  40. 			a[0], a[1], a[2], a[3]);
  41.  
  42. 	b = (int *) a + 1;
  43. 	c = (int *) ((char *) a + 1);
  44.  
  45. 	// a, a+4, a+1
  46. 	printf("6: a = %p, b = %p, c = %p\n", a, b, c);
  47.  
  48. 	return 0;
  49. }
  50.  
Success #stdin #stdout 0s 9424KB
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stdin
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Standard input is empty
stdout
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1: a = 0x7ffe7d4fd3e0, b = 0x2b7d5b1b9010, c = (nil)
2: a[0] = 200, a[1] = 101, a[2] = 102, a[3] = 103
3: a[0] = 200, a[1] = 300, a[2] = 301, a[3] = 302
4: a[0] = 200, a[1] = 400, a[2] = 301, a[3] = 302
5: a[0] = 200, a[1] = 128144, a[2] = 256, a[3] = 302
6: a = 0x7ffe7d4fd3e0, b = 0x7ffe7d4fd3e4, c = 0x7ffe7d4fd3e1
https://ideone.com/4FlgSd
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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