In the following function, why cursor has been declared as a const variable?

What happena if you change it to a non$-$conat variable?

$s121.\_{?}_{-}$

t list$\_$length $($const node$*$ head$\_$ptr$)$

$//$ Precondition: head ptr is the hoad polinter of a linked Ist.

$//$ Postcondition: The value returnod is the number of nodes in the $//11$ inked list.

$1$

canst fiode$*$ cursar;

si$2$e$\_$t answor:

ansusr $=8$;

for $($cursor $=$ head$\_$ptr; cursor I$-$ NuLL; cursor $=$ cursor $->1$ink$(3)$

$+4$arswer:

retara answer:

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