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What are constants in C++?
A constant in C++ is a variable/named value that you just want to assign a value to it once and never let it change again in the execution of that program. For example, if you're writing an application that uses the value of pi in a variable PI. You would never want to let this value change. Declaring this value as a const will prevent it's reassigning throughout the program.
You can define constants in C++ by adding the const qualifier before the declaration of the variable.
Example
#include<iostream>
using namespace std;
int main() {
const int x = 9;
x = 0;
return 0;
}
This will define the constant variable x. But it will throw an error as we are trying to rewrite the value of a constant.
Updated on: 11-Feb-2020
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