What happens if you try to change a const variable in C++?

 In C++, if you try to change the value of a const variable, the compiler will generate an error at compile-time, preventing you from modifying the variable.

Here is an example:

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#include <iostream>
using namespace std;

int main() {
    const int x = 5;
    x = 10;  // This line will generate a compile-time error
    return 0;
}

In this code, x is declared as a const variable with an initial value of 5. The line x = 10; tries to modify the value of x, which is not allowed since x is declared as const. When you try to compile this code, the compiler will generate an error message similar to the following:

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error: assignment of read-only variable 'x'

So, in short, attempting to change a const variable in C++ results in a compile-time error.