Problem $7(6$ points$)$

Verify that the given program segment is correct with respect to the initial assertion T and the final

assertion $y=2,$ using three cases.

if $x<mn>0</mn>$ then

$y$:$=-2|x\frac{|}{x}$

else if $x>0$ then

$y$:$=2|x\frac{|}{x}$

else if $x=0$ then

$y$:$=2$