c assignment of read only variable

I have some C++ code that returns this error: error: assignment of read-only variable ‘parking’ The code: char const * const parking= "false"; if (phidgets.value(PHIDGET3V_1) > 1000) { parking = "true"; } else{ parking = "false"; } What does this error mean and how do I fix it?

The TIME variable is declared a const, so you will only be able to read its value but not modify it, that is what the compiler is letting you know in the error. If you HAVE to modify that variable then you have to remove the const qualifier.

Error "assignment of read-only variable in C" occurs, when we try to assign a value to the read-only variable i.e. constant. In this program, a is a read-only variable or we can say a is an integer constant, there are two mistakes that we have made:

You are defining a constant (read only variable) testB, and trying to change the value of it inside the method testFunction - this isn't allowed. Imagine you had several other methods that tried to assign this value to different things (true/false) - it's not really a readonly constant, is it?

Whenever we use const qualifier with variable name, it becomes a read-only variable and get stored in .rodata segment. Any attempt to modify this read-only variable will then result in a compilation error: “assignment of read-only variable”.

Whenever we use const qualifier with variable name, it becomes a read-only variable and get stored in .rodata segment. Any attempt to modify this read-only variable will then result in a compilation error: "assignment of read-only variable".

const <data_type> <var_name> = <value>; Adding the const keyword in the definition of the variable ensures that its value remains unchanged in the program. The const qualifier makes the variable read-only. And trying to modify it elsewhere in the program will throw errors during compilation.

To resolve this error, there are a few possible solutions. First, you can remove the assignment statement that modifies the read-only parameter 'n'. Alternatively, you can declare a new variable and assign the value of 'n' to it, then perform the desired operations on the new variable instead.

The point is that C++ doesn't have a keyword that permits a variable to be read but not modified by non-friends and non-members of a certain class. This article was meant to teach you how to do this in the absence of such a keyword.

Error "assignment of read-only variable in C" occurs, when we try to assign a value to the read-only variable i.e. constant. In this program, a is a read-only variable or we can say a is an integer constant, there are two mistakes that we have made: