Next to the above lines, create a struct that contains four items: $(1)$ a variable named $$pid$$ of int type, $(2)$ a

variable named $$QC$$ of char type, and $(3)$ a variable of string type named $$serialNo$,$ and $(4)$ one pointer of

the struct type named $$next$.$

$3.$ Use the struct to create a singly linked list.

$4.$ Create a function named $$addProduct$()$ that takes three parameters: $(1)$ one int type for $$pid$,(2)$ one char

type for $$QC$,$ and $(3)$ one string variable for $$serialNo$.$ Be sure to apply the concept of $$first$-$in$-$first$-$out$.$

$5.$ In the $$main$()$ function, use the $$addProduct$()$ function to enter the following records.