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  1. #include <stdio.h>
  2. #include <limits.h>
  3. #include <stdlib.h>
  4.  
  5. #define false 0
  6. #define true 1
  7. typedef int bool;
  8.  
  9. void debug(unsigned x) {
  10.   for(int i=sizeof(x)<<3; i; i--) putchar('0'+((x>>(i-1))&1));
  11. }
  12.  
  13. int main(void) {
  14.   unsigned value  = 0b0000000000001101101010110110;
  15.   unsigned mask = 0b11011;
  16.   unsigned imask = 0b11111;
  17.   unsigned dig = sizeof(unsigned)*CHAR_BIT;
  18.   unsigned i,tmp;
  19.   bool found = false;
  20.   for(i=0; i<dig-5; 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-5-i)));
  27.   	printf("\n");
  28.   	printf("         mask: ");
  29.   	debug(mask << (dig-5-i));
  30.   	printf("\n ---\n");
  31.   	if ((value & (imask << (dig-5-i))) == (mask << (dig-5-i))) {
  32.   	  found = true;
  33.   	  break;
  34.   	} 
  35.   }
  36.   if (found) {
  37.   	printf("нашли: %d", dig-i-1);
  38.   } else {
  39.   	printf("не нашли!!");
  40.   }
  41.   return 0;
  42. }
  43.  
Success #stdin #stdout 0s 4396KB
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stdin
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Standard input is empty
stdout
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i = 0
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 11011000000000000000000000000000
 ---
i = 1
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 01101100000000000000000000000000
 ---
i = 2
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 00110110000000000000000000000000
 ---
i = 3
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 00011011000000000000000000000000
 ---
i = 4
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 00001101100000000000000000000000
 ---
i = 5
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 00000110110000000000000000000000
 ---
i = 6
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 00000011011000000000000000000000
 ---
i = 7
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 00000001101100000000000000000000
 ---
i = 8
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 00000000110110000000000000000000
 ---
i = 9
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 00000000011011000000000000000000
 ---
i = 10
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 00000000001101100000000000000000
 ---
i = 11
value        : 00000000000000001101101010110110
value & imask: 00000000000000000000000000000000
         mask: 00000000000110110000000000000000
 ---
i = 12
value        : 00000000000000001101101010110110
value & imask: 00000000000000001000000000000000
         mask: 00000000000011011000000000000000
 ---
i = 13
value        : 00000000000000001101101010110110
value & imask: 00000000000000001100000000000000
         mask: 00000000000001101100000000000000
 ---
i = 14
value        : 00000000000000001101101010110110
value & imask: 00000000000000001100000000000000
         mask: 00000000000000110110000000000000
 ---
i = 15
value        : 00000000000000001101101010110110
value & imask: 00000000000000001101000000000000
         mask: 00000000000000011011000000000000
 ---
i = 16
value        : 00000000000000001101101010110110
value & imask: 00000000000000001101100000000000
         mask: 00000000000000001101100000000000
 ---
нашли: 15
https://ideone.com/Gmisjg
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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