What is the need of defining a Constructor explicitly?

 We are already aware that if we don't define a constructor in the class, still a implicit constructor comes  into picture and initializes some variables of class but we explicitly defines constructor under class so we have a chance of initializing variables of class with desired values.

Each and every class requires some initialization values foe execution so if we defined a constructor under the class we have a chance of sending our own initialization values for the class to execute and this values can be changed whenever wee create a new object for the class.

In the below below case, the four methods of the class requires the values for x and y to execute and those two variables are being initialized under the constructor so when and where we want to consume this class we can send values for x and y while creating the objects and then call all the four methods:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CSharpConsole
{
    class Math
    {
        int x, y;
        public Math(int x, int y)
        {
            this.x = x;
            this.y = y;
        }
        public void Add(int x, int y)
        {
            Console.WriteLine(x + y);
        }
        public void Sub(int x, int y)
        {
            Console.WriteLine(x - y);
        }
        public void Mul(int x, int y)
        {
            Console.WriteLine(x * y);
        }
        public void Div(int x, int y)
        {
            Console.WriteLine(x / y);
        }
       
     }
}