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Can somebody explain how this function works? Especially why did they chose to use flag as !!x? int conditional(int x, int y, int z) {

Can somebody explain how this function works? Especially why did they chose to use flag as !!x?

int conditional(int x, int y, int z) {

int flag = !!x;

int a = y ^ z;

int b = a ^ ( y & (~0 + flag)) ^ ( z & (~0 + !flag));

return b;

}

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