Bit operator: Left shift and Right shift (Signed or unsigned? )

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No matter left shift or right shift, the result's sign should always be the same as its left operand .

By default, const numbers in C/C++ is signed.

-Wsign-compare

{

unsigned int j = 3;

int k = 5;

if (j == (1 << (j))); // warning: comparison between signed and unsigned integer expressions.

if (j == ((( unsigned int)1) << (j)));

if (k == (1 << (k)));

if (k == ((( unsigned int)1) << (k))); // warning: comparison between signed and unsigned integer expressions.

if (j == (j >> 1));

if (j == (k >> 1)); // warning: comparison between signed and unsigned integer expressions.

if (k == (k >> 1));

if (k == (j >> 1)); // warning: comparison between signed and unsigned integer expressions.

}

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