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  1.     #include <stdio.h>
  2.     #include <stdint.h>
  3.  
  4.     uint32_t flip(uint32_t n)
  5.     {
  6.         if (n == 0) return 0;
  7.  
  8.         uint32_t mask = (uint32_t)~0 >> __builtin_clz(n);
  9.         return n ^ mask;
  10.     }
  11.  
  12.     int main()
  13.     {
  14.         printf("%#x\n", flip(0xaa55));
  15.     }
  16.  
Success #stdin #stdout 0s 5428KB
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stdin
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Standard input is empty
stdout
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0x55aa
https://ideone.com/2zg1b3
language:
C (gcc 8.3)
created:
3 years ago
visibility:
secret

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