sorting_20the_20characters_20in_20a_20string
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sorting_20the_20characters_20in_20a_20string [2018/03/31 13:19] 127.0.0.1 external edit |
sorting_20the_20characters_20in_20a_20string [2018/04/17 18:52] tbest3112 Added syntax highlighting |
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| //by Richard Russell, October 2008//\\ \\ You can quickly and easily sort the elements of an **array** by using the [[http://www.bbcbasic.co.uk/bbcwin/manual/bbcwing.html#sortlib|SORTLIB]] library, but //BBC BASIC for Windows// does not directly provide the facility to sort the characters in a **string**. The code listed below allows you to do that.\\ \\ First you should initialise **SORTLIB** in the usual way, just once at the start of your program: \\ \\ | //by Richard Russell, October 2008//\\ \\ You can quickly and easily sort the elements of an **array** by using the [[http://www.bbcbasic.co.uk/bbcwin/manual/bbcwing.html#sortlib|SORTLIB]] library, but //BBC BASIC for Windows// does not directly provide the facility to sort the characters in a **string**. The code listed below allows you to do that.\\ \\ First you should initialise **SORTLIB** in the usual way, just once at the start of your program: \\ \\ | ||
| + | <code bb4w> | ||
| INSTALL @lib$+"SORTLIB" | INSTALL @lib$+"SORTLIB" | ||
| Sort% = FN_sortinit(0,0) | Sort% = FN_sortinit(0,0) | ||
| + | </code> | ||
| Change the parameters of **FN_sortinit** if necessary, as explained [[http://www.bbcbasic.co.uk/bbcwin/manual/bbcwing.html#sortinit|here]].\\ \\ The following function sorts a string into an ascending (or descending) sequence of characters:\\ \\ | Change the parameters of **FN_sortinit** if necessary, as explained [[http://www.bbcbasic.co.uk/bbcwin/manual/bbcwing.html#sortinit|here]].\\ \\ The following function sorts a string into an ascending (or descending) sequence of characters:\\ \\ | ||
| + | <code bb4w> | ||
| DEF FNsortstring(A$) | DEF FNsortstring(A$) | ||
| LOCAL C%, A&() | LOCAL C%, A&() | ||
| Line 12: | Line 15: | ||
| CALL Sort%, A&(0) | CALL Sort%, A&(0) | ||
| = $$^A&(0) | = $$^A&(0) | ||
| + | </code> | ||
| This works by temporarily creating a **byte array**, copying the string into the array, sorting the byte array, and finally returning the contents of the array as a string. | This works by temporarily creating a **byte array**, copying the string into the array, sorting the byte array, and finally returning the contents of the array as a string. | ||
sorting_20the_20characters_20in_20a_20string.txt ยท Last modified: 2018/04/17 18:52 by tbest3112
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