c++ - bitwise right-shift of negative numbers -

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this question has answer here:

i looked @ binary representations of negative integers under influence of bit-shift , noticed bitshifting behaves differently these positive ones.

int imax = std::numeric_limits<int>::max();  std::bitset<32> bs0(imax+1);  std::cout << bs0 << "\n";  std::bitset<32> bs1((imax+1) >> 1);  std::cout << bs1 << "\n";  std::bitset<32> bs2((imax+1) >> 2);  std::cout << bs2 << "\n";

output:

10000000000000000000000000000000 11000000000000000000000000000000 11100000000000000000000000000000

what had expected was:

10000000000000000000000000000000 01000000000000000000000000000000 00100000000000000000000000000000

what behaviour for? or - if there no reason per se - why happen?


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