HP Prime/Commands/Guides/All About Strings
The string data type has a type ID of 2.
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:
|\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.|
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); s := 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 := "World";
The length of the string assigned to is preserved; that is, if the replacement would make the string longer, it is truncated instead.
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.