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a4ap Arrays and Pointers
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        In this program  we observe how GCC treats  arrays, pointers and
        how they  resemble each other.  It is useful to  understand that
        arrays are some kind of pointer constants.

        Compile  the following  program  (file a4ap.c)  and observe  the
        compiler output GIMPLEs to answer the questions.

        Source file : a4ap.c
        Compilation : gcc -c -fdump-tree-gimple a4ap.c
        View result : vi -O a4ap.c a4ap.c.004t.gimple
        Clear dumps : rm -f a4ap.c.* a4ap.o

Program
-------

        #include <stdio.h>
        int main()
        {
            int a[256], c, d;
            int *b;
            b = a;
            *(b + 3) = 20;
            c = a[2];
            a[3] = a[4];
            printf("%d, %d, %d, %d", a[3], *b, c+1, d);
        }

Questions
---------

        1   How does the line "*(b + 3) = 20" get translated? Why is the 3
            converted to 12 in GIMPLE?
            
        2   Does the statement "c = a[2]" get broken down in GIMPLE? What 
            about "a[3] = a[4]"?
            
        3   How are parameters passed to the function printf()?