Difference Between Function and Constructor

Function V/s Constructor

1. We can give any suitable name to function but constructor name will be the name of class.

In the following example you can see that i have created constructor pqr which is on the name of class but i have created function with the name of sum().

		public class pqr
{

public int p, q;

public pqr()
    {
        p = 10;
        q = 20;
    }

    public int sum()
    {
        return (p + q);
    }
}

		

2. Function have return type but constructor don't have return type not even void.

		//constructor
public pqr()
    {
        p = 10;
        q = 20;
    }

	// function
    public int sum()
    {
        return (p + q);
    }

3. Constructor calls once at the time of object creation but funcation can be called with object and without object(static funcation) many times.