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  1. #include <stdio.h>
  2. #include <stdint.h>
  3. #include <string.h>
  4. #include <inttypes.h>
  5.  
  6. union Str
  7. {
  8.    uint64_t a;
  9.    char  str[8];
  10. };
  11.  
  12. int main(void)
  13. {
  14.   union Str str;
  15.   memcpy( &str.str, "12345678", sizeof(str.a));
  16.  
  17.   str.a = ((str.a & 0x0F000F000F000F00) >> 8  ) +
  18.           ((str.a & 0x000F000F000F000F) *  10 );
  19.  
  20.   str.a = ((str.a & 0xFFFF0000FFFF0000) >> 16 ) +
  21.           ((str.a & 0x0000FFFF0000FFFF) *  100 );
  22.  
  23.   str.a = ((str.a & 0xFFFFFFFF00000000) >> 32 ) +
  24.           ((str.a & 0x00000000FFFFFFFF) *  10000 );
  25.   //little-endian only. Можно переделать под big-endian
  26.  
  27.   printf("%"PRIu64, str.a);
  28.  
  29. return 0;
  30. }
Success #stdin #stdout 0s 1832KB
comments (?)
stdin
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Standard input is empty
stdout
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12345678
https://ideone.com/O82fXO
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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