HP 39gII, Руководство пользователя

Страница: 283 / 355

Programming 273
String
commands
A string is a sequence of characters enclosed in double
quotes (""). To put a double quote in a string, use two
consecutive double quotes. The \ character starts an
"escape" sequence, and the character(s) immediately
following are interpreted specially. \ n inserts a new line,
two backslashes insert a single backslash.
Example:
PRINT
( "Hello\nWorld!" ) displays
Hello
World!
on the terminal.
+ Syntax: str1
+
str2 or str1
+
expression
Adds two strings together.
Example 1:
"QUICK"
+
"DRAW" returns "QUICKDRAW"
Example 2: 32 X;"X = "
+
X returns "X = 32"
asc Syntax:
asc
( str )
Returns a vector containing the ASCII codes of string str .
Example:
asc
( "AB" ) returns [65,66]
char Syntax:
char
( vector or int )
Returns the string corresponding to the character codes in
vector , or the single code int .
Examples:
char
( 65 ) returns "A";
char
([82,77,72])
returns "RMH"
dim Syntax:
dim
( str )
Returns the number of characters in string str .
Example:
dim
( "12345" ) is 5,
dim
( """" ) and
dim
( "\n" )
are both 1 (notice the use of the two double quotes and
the escape sequence).
expr Syntax:
expr
( str )
Parses the string str into a number or expression.
Examples:
expr
( "2+3" ) returns 5. If the variable X has
the value 90, then expr( "X+10" ) returns 100. In a