String()

[Data Types]

Description

Constructs an instance of the String class. There are multiple versions that construct Strings from different data types (i.e. format them as sequences of characters), including:

  • a constant string of characters, in double quotes (i.e. a char array)

  • a single constant character, in single quotes

  • another instance of the String object

  • a constant integer or long integer

  • a constant integer or long integer, using a specified base

  • an integer or long integer variable

  • an integer or long integer variable, using a specified base

  • a float or double, using a specified decimal palces

Constructing a String from a number results in a string that contains the ASCII representation of that number. The default is base ten, so

String thisString = String(13);

gives you the String "13". You can use other bases, however. For example,

String thisString = String(13, HEX);

gives you the String "D", which is the hexadecimal representation of the decimal value 13. Or if you prefer binary,

String thisString = String(13, BIN);

gives you the String "1101", which is the binary representation of 13.

Syntax

String(val)
String(val, base)
String(val, decimalPlaces)

Parameters

val: a variable to format as a String - Allowed data types: string, char, byte, int, long, unsigned int, unsigned long, float, double
base (optional): the base in which to format an integral value decimalPlaces (only if val is float or double): the desired decimal places

Returns

an instance of the String class.

Example Code

All of the following are valid declarations for Strings.

String stringOne = "Hello String";                                     // using a constant String
String stringOne =  String('a');                                          // converting a constant char into a String
String stringTwo =  String("This is a string");                 // converting a constant string into a String object
String stringOne =  String(stringTwo + " with more"); // concatenating two strings
String stringOne =  String(13);                                          // using a constant integer
String stringOne =  String(analogRead(0), DEC);          // using an int and a base
String stringOne =  String(45, HEX);                                // using an int and a base (hexadecimal)
String stringOne =  String(255, BIN);                               // using an int and a base (binary)
String stringOne =  String(millis(), DEC);                        // using a long and a base
String stringOne =  String(5.698, 3);                                // using a float and the decimal places

Functions

Operators

See also

  • LANGUAGE array

  • LANGUAGE boolean

  • LANGUAGE byte

  • LANGUAGE char

  • LANGUAGE double

  • LANGUAGE float

  • LANGUAGE int

  • LANGUAGE long

  • LANGUAGE short

  • LANGUAGE string

  • LANGUAGE unsignedChar

  • LANGUAGE unsignedInt

  • LANGUAGE unsignedLong

  • LANGUAGE void

  • LANGUAGE word