define a float - Programming - Arduino Forum
Jan 28, 2018 · Hello, I am all new to Arduino and C++ and trying to learn/understand it. It was 25+ years ago I did some programming in a non high level scripting language. Only playing with Python for the …
A basic question about "float" and "double" - Arduino Forum
Mar 17, 2019 · Hi friends! Maybe the next question is very basic, but I don't understand deeply the meaning of variable "float". If you search the definition of variable float in webpage of Arduino: float - …
#define vs const - Programming - Arduino Forum
Sep 17, 2019 · Yes, you can use "const float", but double and float are not the same. For AVR-based Arduinos, double and float are treated as equivalent, 32 bits in each case. #define is a text …
Using #define for math function - Programming - Arduino Forum
#define rise 32450 #define run 400 #define slope (rise/run) That is the same as: #define slope (32450/400) The compiler replaces the text and after that the compiler starts compiling the source …
When to use const int, int, or #define - Arduino Forum
Jul 30, 2020 · What is the main difference between these when naming a variable? Is what I am about to say correct? 'const int' will mainly be used when needing to declare a specific value/target to a …
define a float - Page 2 - Programming - Arduino Forum
Jan 28, 2018 · What would be the difference between this solution and the ones suggested in #4 and #6 #define R1 984000 #define R2 472000 const float batFact = ( (1.1/1023)* ( ( (float)R1+R2)/R2)); just …
Why do people use #define insted of int/char/float
Jan 13, 2014 · I don't understad why people declaring values with #define? If i want do declare an int value of 4 i write int value = 4; and not #define value 4 What the difference?
Decimal places variables - Programming - Arduino Forum
Nov 8, 2021 · From the reference on the float data type. The float data type has only 6-7 decimal digits of precision. That means the total number of digits, not the number to the right of the decimal point. …
Initialise array to NaN - Programming - Arduino Forum
Nov 24, 2024 · IDE V 1.8.19 Target esp8266. Application: Web based reticulation controller and temperature humidity plotter. I like the idea of returning NAN for situations where probes and sensors …
Limiting float values to 2 decimal places - Arduino Forum
Jul 16, 2016 · On Arduino, float variables are single precision and have accuracy to only 6-7 decimal places. To get 9 decimal places, all calculations must be done using long integers.