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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. int main(void) {
  5. 	int i;
  6.     uint64_t x = 0xEFCDAB01;
  7.  
  8.     printf("binary input as a single integer: %08lX\n", x);
  9.  
  10.     printf("binary input as a sequence of integer bytes: ");
  11.     for (i = 0; i < 4; ++i)
  12.     	printf("%02hhX", ((char *)&x)[i]);
  13.     putchar('\n');
  14.  
  15.     x = ((x & 0x00000000ffff0000LL) << 16) | (x & 0x000000000000ffffLL);
  16. 	x = ((x & 0x0000ff000000ff00LL) << 8)  | ((x & 0x000000ff000000ffLL) >> 0);
  17. 	x = ((x & 0x000f000f000f000fLL) << 8)  | ((x & 0x00f000f000f000f0LL) >> 4);
  18. 	x = (x + 0x3030303030303030LL) +
  19. 		(((x + 0x0606060606060606LL) & 0x1010101010101010LL) >> 4) * 7;
  20.  
  21.     printf("hex output as a single integer: %016lX\n", x);
  22.  
  23.     printf("hex output as a sequence of chars: ");
  24.     for (i = 0; i < 8; ++i)
  25.     	putchar(((char *)&x)[i]);
  26.     putchar('\n');
  27.  
  28. 	return 0;
  29. }
Success #stdin #stdout 0s 5516KB
comments (?)
stdin
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Standard input is empty
stdout
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binary input as a single integer: EFCDAB01
binary input as a sequence of integer bytes: 01ABCDEF
hex output as a single integer: 4645444342413130
hex output as a sequence of chars: 01ABCDEF
https://ideone.com/lXrk82
language:
C (gcc 8.3)
created:
3 years ago
visibility:
public

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