y = 1; if( x >= 0 ) if( x == 0 ) y = 0; else y = -1;
y = -1; if( x != 0 ) if( x > 0 ) y = 1; else y = 0
if( x <= 0 ) if( x < 0 ) y = -1; else y = 0; else y = 1;
y = -1; if( x <= 0 ) if( x < 0 ) y = -1; else y = 0;
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