PROC usage = VOID: printf(($gl$, "Usage: please provide a string")); PROC duplicate character counter = (STRING s) REF INT: ( # Initialize character counter # HEAP [0..255]INT char counter; FOR k FROM LWB char counter TO UPB char counter DO char counter[k] := 0 OD; # Count number of occurances of each character # FOR k TO UPB s DO char counter[ABS s[k]] +:= 1 OD; char counter ); PROC show duplicate character counts = (STRING s, REF INT char counter) VOID: ( BOOL has dupes := FALSE; INT code; FOR k TO UPB s DO code := ABS s[k]; IF char counter[code] > 1 THEN printf(($g": "gl$, s[k], whole(char counter[code], 0))); char counter[code] := 0; has dupes := TRUE FI OD; IF NOT has dupes THEN printf(($gl$, "No duplicate characters")) FI ); # Get 1st command-line argument. Exit if empty # STRING s := argv(4); IF UPB s = 0 THEN usage; stop FI; # Count duplicate characters # REF INT char counter := duplicate character counter(s); # Show all duplicate character counts in order in which they occurred in string (if any) # show duplicate character counts(s, char counter)
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