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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
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