HP Prime/Commands/Guides/All About Strings
The string data type has a type ID of 2.
Making Constants
String constants are enclosed "like this". An unclosed string constant is always a syntax error.
You can use backslash escapes in string constants. The valid escapes are the following:
| Escape code | Meaning |
|---|---|
| \n | Newline |
| \r | Carriage Return |
| \t | Tab |
| \\ | Backslash |
| \" | Double-quote |
| "" | Double-quote |
| \0 | NUL |
| \nnn | Where 'nnn' is an octal number: The literal character with code nnn. '100', the lowest valid nnn, is @. |
| \Xnn | Where 'nn' is an hex number: The literal character with code nn. |
| \unnnn | Where 'nnnn' is an hex number: The literal character with code nn. The 16-bit version of \X. |
Use
String variables are indexable. Getting a number from a string results in a character code, and setting it sets a character code:
LOCAL s := "Hello"; PRINT(s[1]); s[1] := 52;
The number has to be in range, else an error is thrown. Decimals are rounded down to integers.
Getting a substring can be done by indexing a string variable with two arguments. The first one is index, and the second is the number of characters to get:
LOCAL s := "Hello"; PRINT(s[2,2]);
The second number has to be any number greater than or equal to zero.
Setting an index of a string with another string performs a limited replacement.
LOCAL s := "Hello"; s[1] := "World";
The length of the string assigned to is preserved; that is, if the replacement would make the string longer, it is truncated instead.
Limits
Strings may have at maximum 65,535 (2^16-1) characters in them. Attempting to create a longer string will result in error 38 being thrown.