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(Created page with "The LEFT$ string function returns a number of characters from the left of a STRING. {{PageSyntax}} : LEFT$({{Parameter|stringValue$}}, {{Parameter|numberOfCharacters%}}) {{Parameters}} * {{Parameter|stringValue$}} can be any STRING literal or variable. * {{Parameter|numberOfCharacters%}} INTEGER determines the number of characters to return from left of string. {{PageDescription}} * If the number of characters exceeds the string length the entir...") |
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{{PageExamples}} | {{PageExamples}} | ||
''Example 1:'' Getting the left portion of a string value. | ''Example 1:'' Getting the left portion of a string value. | ||
{{CodeStart}} | {{CodeStart}} | ||
name$ = "Tom Williams" | name$ = "Tom Williams" | ||
First$ = LEFT$(name$, 3) | First$ = LEFT$(name$, 3) | ||
PRINT First$ | PRINT First$ | ||
{{CodeEnd}} | {{CodeEnd}} | ||
{{OutputStart}}Tom {{OutputEnd}} | {{OutputStart}}Tom {{OutputEnd}} | ||
''Example 2:'' A replace function using LEFT$ and [[RIGHT$]] with [[INSTR]] to insert a different length word into an existing string. | ''Example 2:'' A replace function using LEFT$ and [[RIGHT$]] with [[INSTR]] to insert a different length word into an existing string. | ||
{{CodeStart}} | {{CodeStart}} | ||
text$ = "This is my sentence to change my words." | text$ = "This is my sentence to change my words." | ||
{{Cl|PRINT}} text$ | {{Cl|PRINT}} text$ | ||
oldword$ = "my" | oldword$ = "my" | ||
newword$ = "your" | newword$ = "your" | ||
x = Replace(text$, oldword$, newword$) | x = Replace(text$, oldword$, newword$) | ||
{{Cl|IF...THEN|IF}} x {{Cl|THEN}} {{Cl|PRINT}} text$; x | {{Cl|IF...THEN|IF}} x {{Cl|THEN}} {{Cl|PRINT}} text$; x | ||
| Line 53: | Line 53: | ||
{{Cl|LOOP}} {{Cl|WHILE}} find | {{Cl|LOOP}} {{Cl|WHILE}} find | ||
Replace = count 'function returns the number of replaced words. Comment out in SUB | Replace = count 'function returns the number of replaced words. Comment out in SUB | ||
{{Cl|END FUNCTION}} | {{Cl|END FUNCTION}} | ||
{{CodeEnd}} | {{CodeEnd}} | ||
{{OutputStart}}This is my sentence to change my words. | {{OutputStart}}This is my sentence to change my words. | ||
Revision as of 01:56, 23 January 2023
The LEFT$ string function returns a number of characters from the left of a STRING.
Syntax
- LEFT$(stringValue$, numberOfCharacters%)
- stringValue$ can be any STRING literal or variable.
- numberOfCharacters% INTEGER determines the number of characters to return from left of string.
Description
- If the number of characters exceeds the string length the entire string is returned. Use LEN to determine a string's length.
- LEFT$ returns always start at the first character of the string, even if it's a space. LTRIM$ can remove leading spaces.
- numberOfCharacters% cannot be a negative value.
Examples
Example 1: Getting the left portion of a string value.
name$ = "Tom Williams" First$ = LEFT$(name$, 3) PRINT First$ |
Tom |
Example 2: A replace function using LEFT$ and RIGHT$ with INSTR to insert a different length word into an existing string.
text$ = "This is my sentence to change my words." PRINT text$ oldword$ = "my" newword$ = "your" x = Replace(text$, oldword$, newword$) IF x THEN PRINT text$; x END FUNCTION Replace (text$, old$, new$) 'can also be used as a SUB without the count assignment DO find = INSTR(start + 1, text$, old$) 'find location of a word in text IF find THEN count = count + 1 first$ = LEFT$(text$, find - 1) 'text before word including spaces last$ = RIGHT$(text$, LEN(text$) - (find + LEN(old$) - 1)) 'text after word text$ = first$ + new$ + last$ END IF start = find LOOP WHILE find Replace = count 'function returns the number of replaced words. Comment out in SUB END FUNCTION |
This is my sentence to change my words. This is your sentence to change your words. |
- Note: The MID$ statement can only substitute words or sections of the original string length. It cannot change the string length.
See also