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:
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a constant string of characters, in double quotes (i.e. a char array)
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a single constant character, in single quotes
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another instance of the String object
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a constant integer or long integer
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a constant integer or long integer, using a specified base
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an integer or long integer variable
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an integer or long integer variable, using a specified base
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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.