Plus

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+

The symbol + (pronounced “plus”) is used to:

• explicitly indicate the positive sign of a number,
• add two numbers resulting to a number,
• form a union of sets,
• (FPC) concatenate two strings (or characters; except pchar).

 0program plusDemo(input, output, stderr);
 1
 2var
 3	x: longint;
 4	g: set of (foo, bar);
 5	m: string;
 6begin
 7	// unary operator: positive sign
 8	x := +7;                    // x becomes positive 7
 9	x := +$100;                 // x becomes 256
10	                            // (dollar sign denotes hexadecimal base)
11	
12	// addition
13	x := 7 + 7;                 // x becomes 14
14	x := 7 + 7 + 7 + 7 + 7 + 7; // x becomes 42
15	
16	// union of sets
17	g := [foo] + [bar];         // g becomes [foo, bar]
18	
19	// concatenation of strings and/or characters (FPC/Delphi extension)
20	m := 'Hello ' + 'world!';   // m becomes 'Hello world!'
21end.

see also

• system.add
• system.concat returns concatenation of strings
• strings.strcat returns concatenation of pchar strings