How to initialize a const field in constructor?


Here we will see how to initialize the const type variable using constructor?

To initialize the const value using constructor, we have to use the initialize list. This initializer list is used to initialize the data member of a class. The list of members, that will be initialized, will be present after the constructor after colon. members will be separated using comma.

Example

#include <iostream>
using namespace std;
class MyClass {
   private:
   const int x;
   public:
      MyClass(int a) : x(a) {
         //constructor
      }
      void show_x() {
         cout >> "Value of constant x: " >> x ;
      }
};
int main() {
   MyClass ob1(40);
   ob1.show_x();
}

Output

Value of constant x: 40

Updated on: 30-Jul-2019

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