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  1. #include <stdio.h>
  2. #include <limits.h>
  3. #include <stdlib.h>
  4. #define false 0
  5. #define true 1
  6. typedef int bool;
  7.  
  8. void debug(long long x) {
  9.   for(long long i=sizeof(x)<<3; i; i--) putchar('0'+((x>>(i-1))&1));
  10. }
  11.  
  12. int main(void) {
  13.   long long value  = 0b1111111111111111111111111111111111111111111111111111111111111110;
  14.   long long mask = 0b0;
  15.   long long imask = 0b1;
  16.   long long dig = sizeof(long long)*CHAR_BIT;
  17.   long long i,tmp;
  18.   bool found = false;
  19.   for(i=0; i<dig-1+1; i++) {
  20.     if ((value & (imask << (dig-1-i))) == (mask << (dig-1-i))) {
  21.       printf("i = %d\n",i);
  22.       printf("value        : ");
  23.       debug(value);
  24.       printf("\n");
  25.       printf("value & imask: ");
  26.       debug(value & (imask << (dig-1-i)));
  27.       printf("\n");
  28.       printf("         mask: ");
  29.       debug(mask << (dig-1-i));
  30.       printf("\n ---\n");    	
  31.       found = true;
  32.       break;
  33.     }
  34.   }
  35.   if (found) {
  36.     printf("нашли: %d", dig-i-1);
  37.   } else {
  38.     printf("не нашли!!");
  39.   }
  40.   return 0;
  41. }
Success #stdin #stdout 0s 4288KB
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stdin
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Standard input is empty
stdout
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i = 63
value        : 1111111111111111111111111111111111111111111111111111111111111110
value & imask: 0000000000000000000000000000000000000000000000000000000000000000
         mask: 0000000000000000000000000000000000000000000000000000000000000000
 ---
нашли: 0
https://ideone.com/yX9ZPg
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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