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  1. #include <stdio.h>
  2.  
  3. typedef unsigned long long int uint64_t;
  4. typedef unsigned short uint16_t;
  5. typedef unsigned long long int * uintptr_t;
  6.  
  7. uint64_t get_value() {
  8. 	return 0x1020304050607080ULL;
  9. }
  10.  
  11. int main(void) {
  12. 	uint64_t value = get_value();
  13. 	uintptr_t addr = (uintptr_t)&value;
  14.  
  15. 	uint16_t u16 = *(uint16_t*)addr;
  16. 	uint16_t u16_2 = *(uint16_t*)&value;
  17. 	uint64_t u64 = (*(uint64_t*)addr) & 0xFFFF;
  18. 	uint16_t* ptr = (uint16_t*)&value;
  19. 	printf("u16 = 0x%x, u16_2 = 0x%x, u64 = 0x%llx, *ptr=0x%x\n", u16, u16_2, u64, *ptr);
  20.  
  21. 	printf("*ptr = 0x%x\n", *ptr);
  22. 	printf("--- loop start ---\n");
  23. 	for (int i=0; i<4; ++i) {
  24. 		printf("*ptr = 0x%x\n", *ptr);
  25. 		ptr++;
  26. 	}
  27.  
  28. 	printf("value = 0x%llx\n", value);
  29.  
  30. 	return 0;
  31. }
  32.  
Success #stdin #stdout 0s 5536KB
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stdin
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Standard input is empty
stdout
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u16 = 0x7080, u16_2 = 0x7080, u64 = 0x7080, *ptr=0x7080
*ptr = 0x7080
--- loop start ---
*ptr = 0x2230
*ptr = 0x6d1d
*ptr = 0x5609
*ptr = 0x0
value = 0x1020304050607080
https://ideone.com/aKGYoJ
language:
C (gcc 8.3)
created:
3 years ago
visibility:
public

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