Seg$
seg$ extracts a substring defined by the starting position and the ending position out of a CLOB or a string.
seg$(EXP_STRING,EXP_POS1,EXP_POS2)EXP_STRING is an expression returning a CLOB or string value.EXP_POS1 is an expression returning an integer value that is the position of the first character to be extracted.EXP_POS2 is an expression returning an integer value that is the position of the last character to be extracted. # Extraction Of 3 characters from latin alphabetLocal Char ALPHABET(26), DEF(20), WXYZ(20)ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"DEF=seg$(ALPHABET,4,6) : # DEF contains "DEF"WXYZ=mid$(ALPHABET,23,26) : # DEF contains "WXYZ"# inserts a space between every character in a stringMY_TITLE="WELCOME"MY_TITLE=sigma(I=1,len(MY_TITRE),mid$(TITRE,I,I)+" ")# Now MY_TITLE contains "W E L C O M E "The function seg$(EXP_STRING,EXP_POS,EXP_NB) extracts characters from the EXP_STRING string starting at the position EXP_POS1 until the position EXP_POS2.
The type of result is Char.
EXP_POS1 is greater than the length of the string, seg$(EXP_STRING,EXP_POS1,EXP_POS2) returns the null string "".EXP_POS2 is greater than the length of the string, only the remaining characters will be extracted, and the length of the result will be smaller than EXP_POS2-EXP_POS1+1.EXP_POS2 is smaller than EXP_POS1, seg$(EXP_STRING,EXP_POS1,EXP_POS2) returns the null string "".seg$(EXP_STRING,EXP_POS1,EXP_POS2) is equivalent to mid$(EXP_STRING,EXP_POS1,EXP_POS2-EXP_POS1+1).| Error code | Description |
|---|---|
| 10 | The type of argument is not correct. |
| 50 | At least one of the positions is negative. |