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  1. #include <stdio.h>
  2.  
  3. int INT_BIT = sizeof(int);
  4.  
  5. void print_bits(int b[], int size){
  6.         int i = 0;
  7.         while(i < size){
  8.                 printf("%i", b[i]);
  9.                 i++;
  10.         }
  11.         printf("\n");
  12. }
  13.  
  14. void init_bits(int b[], int size){
  15.         int i = 0;
  16.         while(i < size){
  17.                 b[i] = 0;
  18.                 i++;
  19.         }
  20. }
  21.  
  22. void get_bits(int b[], int n){
  23.         int i;
  24.         int bit = 0;
  25.         for(i = 0; i < n; i++){
  26.                 b[i] = (n >> i) & 1;
  27.         }
  28. }
  29.  
  30. int get_int(int b[]){
  31.         int i = 0;
  32.         int a = 0;
  33.         while(i < INT_BIT){
  34.                 a += b[i];
  35.                 a = a << 1;
  36.                 i++;
  37.         }
  38.         return a;
  39. }
  40.  
  41. int main(void){
  42.         int b[INT_BIT];
  43.         init_bits(b, INT_BIT);
  44.         print_bits(b, INT_BIT);
  45.         int b2[4];
  46.         get_bits(b, 7);
  47.         print_bits(b, 3);
  48.         printf("%i\n",get_int(b2));
  49.         printf("%i\n",get_int(b));
  50.         return 0;
  51. }
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