Examine the following loop segment Prove that it is correct by proving the invariant Q

Computer Networking: A Top-Down Approach (7th Edition)
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QUESTION 3
Examine the following loop segment Prove that it is correct by proving the invariant Q
Q:j = x - i
// returns the value of (x-y) given non- negative integers x, y
local variables: integers i,j
i=0
j= x
while iy do
j=j-1
i= l+1
end while
//j now has the value of (x - y)
return j
Transcribed Image Text:QUESTION 3 Examine the following loop segment Prove that it is correct by proving the invariant Q Q:j = x - i // returns the value of (x-y) given non- negative integers x, y local variables: integers i,j i=0 j= x while iy do j=j-1 i= l+1 end while //j now has the value of (x - y) return j
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