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#include <stdio.h>
int sum_and_diff (int a, int b, int *res)
...
    sum_and_diff (5, b, &diff));
    printf ("The difference of 5 and %d is %d\n", b, diff);
}

SCALAR(0x60008a730) --> reference to a scalar
ARRAY(0x60008a828)  --> reference to an array
REF(0x600003e80)    --> reference to a reference

$$x  # dereference reference to scalar (if $x is a scalar)
@$x  # dereference reference to array (if $x is reference to an array)
@$$x # dereference reference to reference of an array