1($var) $ var2<?="Hello World?"?>3(1) (-1e10) (0xabcdef) 'y'4[x] x->y x.y5!x ~x x++ x-- x*y x&y6x*y x/y x%y7x+y x-y8x<<y x>>y9x<y x<=y x>y x>=y10x==y x!=y11x&y12x^y13x|y14x&&y15x||y16x?y:z17x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y18x,y