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Why do we use const qualifier in C++?
We use the const qualifier to declare a variable as constant. That means that we cannot change the value once the variable has been initialized. Using const has a very big benefit. For example, if you have a constant value of the value of PI, you wouldn't like any part of the program to modify that value. So you should declare that as a const.
Objects declared with const-qualified types may be placed in read-only memory by the compiler, and if the address of a const object is never taken in a program, it may not be stored at all. For example,
#include<iostream>
using namespace std;
int main() {
const int x = 10;
x = 12;
return 0;
}This program would produce an error as we have tried to reassign a const value.
Updated on: 10-Feb-2020
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