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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:
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 "1011", which is the binary representation of 13.
String(val)
String(val, base)
val: a variable to format as a String - string, char, byte, int, long, unsigned int, unsigned long
base (optional) - the base in which to format an integral value
an instance of the String class
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
Corrections, suggestions, and new documentation should be posted to the Forum.
This reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License and is based on the Arduino reference. Code samples in the reference are released into the public domain.