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header {* String examples *}
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theory StringEx imports Main begin
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lemma "hd ''ABCD'' = CHR ''A''"
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by simp
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lemma "hd ''ABCD'' \<noteq> CHR ''B''"
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by simp
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lemma "''ABCD'' \<noteq> ''ABCX''"
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by simp
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lemma "''ABCD'' = ''ABCD''"
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by simp
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lemma "''ABCDEFGHIJKLMNOPQRSTUVWXYZ'' \<noteq>
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''ABCDEFGHIJKLMNOPQRSTUVWXY''"
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by simp
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lemma "set ''Foobar'' = {CHR ''F'', CHR ''a'', CHR ''b'', CHR ''o'', CHR ''r''}"
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by (simp add: insert_commute)
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lemma "set ''Foobar'' = ?X"
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by (simp add: insert_commute)
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end
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