stringObject.adoc

title	categories	subCategories
String()	Variables	자료형

String()

설명

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 places

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.

문법

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

매개변수

val: a variable to format as a String - 허용되는 자료형: string, char, byte, int, long, unsigned int, unsigned long, float, double
base (optional): the base in which to format an integral value decimalPlaces (val 이 float 또는 double): the desired decimal places

반환

an instance of the String class.

예제 코드

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

함수

• LANGUAGE charAt()

• LANGUAGE compareTo()

• LANGUAGE concat()

• LANGUAGE c_str()

• LANGUAGE endsWith()

• LANGUAGE equals()

• LANGUAGE equalsIgnoreCase()

• LANGUAGE getBytes()

• LANGUAGE indexOf()

• LANGUAGE lastIndexOf()

• LANGUAGE length()

• LANGUAGE remove()

• LANGUAGE replace()

• LANGUAGE reserve()

• LANGUAGE setCharAt()

• LANGUAGE startsWith()

• LANGUAGE substring()

• LANGUAGE toCharArray()

• LANGUAGE toInt()

• LANGUAGE toFloat()

• LANGUAGE toLowerCase()

• LANGUAGE toUpperCase()

• LANGUAGE trim()

연산자

• LANGUAGE [] (element access)

• LANGUAGE + (concatenation)

• LANGUAGE += (append)

• LANGUAGE == (comparison)

• LANGUAGE > (greater than)

• LANGUAGE >= (greater than or equal to)

• LANGUAGE < (less than)

• LANGUAGE <= (less than or equal to)

• LANGUAGE != (different from)

• EXAMPLE String Tutorials

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