2015年7月27日 (一) 08:56 Admin

2015-07-27T08:56:40Z

Admin：以“:String {| border="0" cellpadding="20" width="100%" |- |width="100%" valign="top" align="left"| '''String()'''...”为内容创建页面

2015-07-27T08:51:41Z

以“:String {| border="0" cellpadding="20" width="100%" |- |width="100%" valign="top" align="left"| '''String()'''...”为内容创建页面

新页面

:[[String - object|String]]

{| border="0" cellpadding="20" width="100%"
|-
|width="100%" valign="top" align="left"|
'''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.

<pre style="color:dimgray">
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

</pre>

|}

----

[[String - object|返回String]]

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@@ 第11行： / 第11行： @@
 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 constant string of characters, in double quotes (i.e. a char array)
-  -  a single constant character, in single quotes
+ -  a single constant character, in single quotes
-  -  another instance of the String object
+ -  another instance of the String object
-  -  a constant integer or long integer
+ -  a constant integer or long integer
-  -  a constant integer or long integer, using a specified base
+ -  a constant integer or long integer, using a specified base
-  -  an integer or long integer variable
+ -  an integer or long integer variable
-  -  an integer or long integer variable, using a specified base
+ -  an integer or long integer variable, using a specified base
-  -  a float or double, using a specified decimal palces
+ -  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
+<pre style="color:dimgray">
 gives you the String "13". You can use other bases, however. For example,
+<pre style="color:dimgray">
 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.
@@ 第54行： / 第61行： @@
 <font color="orange" size="+1">'''示例'''</font>
 All of the following are valid declarations for Strings.
 <pre style="color:dimgray">
@@ 第70行： / 第75行： @@
 String stringOne =  String(millis(), DEC);                        // using a long and a base
 String stringOne =  String(5.698, 3);                                // using a float and the decimal places
 </pre>

String - String() - 版本历史

2015年7月27日 (一) 08:56 Admin

Admin：以“:String {| border="0" cellpadding="20" width="100%" |- |width="100%" valign="top" align="left"| '''String()'''...”为内容创建页面