Question: Use macro expansion write a program for X1 X2. (which is intended to input two variables, X1 and X2, then replaces the contents of the

Use macro expansion write a program for X1 X2.
(which is intended to input two variables, X1 and X2, then replaces the contents of the former variable, X1, with that of X2, while leaving the contents of the latter unaltered.).

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