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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. #define genmask(x) ((unsigned long long)-1 / ((1LL << (1LL << (x)) * 4) + 1) << (4 * (1 << (x))))
  5.  
  6. int main() {
  7. 	unsigned long long r0 = genmask(0);
  8. 	unsigned long long r1 = genmask(1);
  9. 	unsigned long long r2 = genmask(2);
  10. 	unsigned long long r3 = genmask(3);
  11. 	printf("0x%llx\n", r0);
  12. 	printf("0x%llx\n", r1);
  13. 	printf("0x%llx\n", r2);
  14. 	printf("0x%llx\n", r3);
  15. 	return 0;
  16. }
Success #stdin #stdout 0s 3412KB
comments (?)
stdin
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Standard input is empty
stdout
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0xf0f0f0f0f0f0f0f0
0xff00ff00ff00ff00
0xffff0000ffff0000
0xffffffff00000000
https://ideone.com/Z5qbQS
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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