Arduino - Const

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const keyword

The const keyword stands for constant. It is a variable qualifier that modifies the behavior of the variable.

const makes a variable "read-only". This means that the variable can be used just as any other variable of its type, but its value cannot be changed. You will get a compiler error if you try to assign a value to a const variable.

Example

const float pi = 3.14;
float x;

// ....

x = pi * 2;    // it's fine to use const's in math

pi = 7;        // illegal - you can't write to (modify) a constant

#define or const

You can use either const or #define for creating numeric or string constants. For arrays, you will need to use const.