java - Xor starting with the significant bit -

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int a= 21;//10101 int b = 269;//100001101

a^b 

    10101 100001101 --------- 100011000

but want do

10101 100001101 --------- 001011101

is there way without changing original numbers?

you can shift a align b on left. sample code below works example not handle overflows etc. should give starting point though.

int = 21; int b = 269;  int shift = integer.numberofleadingzeros(a) - integer.numberofleadingzeros(b);  int c = (a << shift) ^ b; system.out.println(integer.tobinarystring(c)); // 1011101

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