By Dettmar J.
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9 FUNCTIONS OPERATE ON POINTERS When we say that an object such as a list or symbol is an input to a function, we are speaking informally. Inside the computer, everything is done with pointers, so the real input to the function isn’t the object itself, but a pointer to the object. Likewise, the result returned by a function is really a pointer. Suppose (THE BIG BOPPER) is supplied as input to REST. What REST actually receives is a pointer to the first cons cell. This pointer is shown below, drawn as a wavy line.
On most computers pointers are four bytes long, so each cons cells is eight bytes. ** Note to instructors: If students are already using the computer, this would be a good time to introduce the SDRAW tool appearing in the appendix. 3 LISTS OF ONE ELEMENT A symbol and a list of one element are not the same. Consider the list (AARDVARK) shown below; it is represented by a cons cell. One of the cons cell’s pointers points to the symbol AARDVARK; the other points to NIL. So you see that the list (AARDVARK) and the symbol AARDVARK are different objects.
C. Shaw, and Herbert Simon had developed. Most programming in the 1950s was done in assembly language, a primitive language defined directly by the circuitry of the computer. Newell, Shaw, and Simon had created something more abstract, called IPL (for Information Processing Language), that manipulated symbols and lists, two important datatypes in artificial intelligence programming. But IPL’s syntax was similar to (and as akward as) assembly language. Elsewhere in the 1950s a new language called FORTRAN was being developed.