string 在arduino草图中将double类型转换为字符串类型
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/19867227/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
convert double type into string type in arduino sketch
提问by Yang
double ambientTemp=44.00;
String yourdatacolumn="yourdata=";
String yourdata;
double yourarduinodata=ambientTemp;
yourdata = yourdatacolumn + yourarduinodata;
//I want the output to be string. but because of yourarduinodata is double type. Can not convert it to string. then , I put (String) in front of yourarduinodata, still doesn't let me run throught.
//我希望输出是字符串。但因为 yourarduinodata 是双类型。无法将其转换为字符串。然后，我把 (String) 放在 yourarduinodata 前面，仍然不让我跑通。
Anyone has any idea about convert double type into string type in arduino sketch;
任何人都知道在 arduino 草图中将 double 类型转换为 string 类型；
回答by Dani Bresler
Another Way To Convert Double To String:
将 Double 转换为字符串的另一种方法：
char TempString[10]; // Hold The Convert Data
dtostrf(ambientTemp,2,2,TempString);
// dtostrf( [doubleVar] , [sizeBeforePoint] , [sizeAfterPoint] , [WhereToStoreIt] )
YourArduinoData = String(TempString); // cast it to string from char
回答by Abhishek Pachlegaonkar
Use - String(val, decimalPlaces)
用 - String(val, decimalPlaces)
example,
例子，
double a = 10.2010;
String SerialData="";
SerialData = String(a,4);
Serial.println(SerialData);
回答by Octopus
Something like this might work:
像这样的事情可能会奏效：
String double2string(double n, int ndec) {
String r = "";
int v = n;
r += v; // whole number part
r += '.'; // decimal point
int i;
for (i=0;i<ndec;i++) {
// iterate through each decimal digit for 0..ndec
n -= v;
n *= 10;
v = n;
r += v;
}
return r;
}
