This program illustrates the swap() member function for list objects.
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For lst1 we have:
Size = 5
Contents: 5 5 5 5 5
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For lst2 we have:
Size = 10
Contents: 10 10 10 10 10 10 10 10 10 10
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Now we swap lst1 and lst2 with lst1.swap(lst2) and redisplay.
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For lst1 we have:
Size = 10
Contents: 10 10 10 10 10 10 10 10 10 10
Press Enter to continue ...

For lst2 we have:
Size = 5
Contents: 5 5 5 5 5
Press Enter to continue ...