string convert doesn't works

Projects Programming
1

Hi Everyone, a trying to convert a float to string using

String(1.125,3) and i obtain this

Call of overloaded 'String(double &, int)' is ambiguous

I using Arduino 1.05-r2

Thanks!!

2

Hi Everyone, a trying to convert a float to string using

My first question would be why ?

The conversion works for me with the same IDE version but it is not obvious how you have tried to do the conversion. Please post the whole program.

3

The error talks about a reference to double, not a double constant, so perhaps that is not
the actual code you used?

4

This is my code

void setup()
{
Serial.begin(9600);
}

void loop() {
String stringOne = "";
stringOne = String(5.698, 3);
Serial.println(stringOne);

while (true);

}

I obtain

Call of overloaded 'String(double,int)' is ambiguous

5

It compiles for me. Uno, IDE 1.5.6-r2, Windows 7

Why do you want to do the conversion anyway ?

6

The String class brings a lot of convenience to the party, but at a pretty heavy memory cost. Your code compiled fine for me (IDE1.6.5) and generated 4996 bytes. The code here:

void setup()
{
  Serial.begin(9600);
}

void loop() {
  char stringOne[10];
  dtostrf(5.698, 8, 3, stringOne);

  Serial.println(stringOne);

  while (true);

}

does the same thing, but uses 3338 bytes of code. In most cases, a string of chars is going to use less memory.

7

I am very grateful Econjack, that's works good. Thank you!

UKHeliBob, I'm working with an accelerometer and i need send the aceleration like a string.

thaks for you help

8

i need send the aceleration like a string.

Do you mean s string (a zero terminated array of chars) or a String (an object created using the String library) ?

9

pacomoib:
and i need send the aceleration like a string.

Perhaps something as simple as Serial.println(accelerationVal);

...R