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  1. #include <stdio.h>
  2.  
  3. int main(void)
  4. {
  5.     unsigned char bits, mask;
  6.     scanf("%hhu", &bits);
  7.  
  8.     mask = 40;
  9.  
  10.     if ((bits & mask) == mask) {
  11.         printf("%d", bits);
  12.     } else {
  13.         printf("%d", -1);
  14.     }
  15.  
  16.     return 0;
  17. }
Success #stdin #stdout 0.01s 5324KB
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stdin
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96
stdout
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-1
https://ideone.com/VTCQbs
Проверяем, что 3 и 5 биты переменной равны 1 (включены)
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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