String - String()

String

String() 描述 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 gives you the String "13". You can use other bases, however. For example, gives you the String "D", which is the hexadecimal representation of the decimal value 13. Or if you prefer binary, gives you the String "1101", which is the binary representation of 13. 语法 String(val) String(val, base) String(val, decimalPlaces) 参数 val: a variable to format as a String - 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 返回值 an instance of the String class 示例 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

---

返回String

返回Arduino语法参考列表

更多建议和问题欢迎反馈至 YFRobot论坛