String Attributes

A string attribute makes alphanumeric information available, e.g. a title, file name, element class name, or an option. It can contain any characters, enclosed in single (') or double (") quotes. However, if it contains a quote, this character must be doubled. Strings can be concatenated using the & operator. An operand in a string can also use the function STRING. String values can occur in string arrays.

Table 2.1: String Operator in MAD-9

Operator	Meaning	result type	operand types
X & Y	concatenate the strings X and Y. String concatenations are always evaluated immediately when read.	string	string,string

Table 2.2: String Function in MAD-9

Function	Meaning	result type	argument type
STRING(X)	return string representation of the value of the numeric expression X	string	real

Examples:

TITLE,"This is a title for the program run ""test""";
CALL,FILE="save";

X=1;
TWISS,LINE=LEP&STRING(X+1);

The second example converts the value of the expression ``X+1'' to a string and appends it to ``LEP'', giving the string ``LEP2''.