no errors but there is no output

Question

ublic class Main

{

int a,b,c;

{

c=a+b;

}

void display()

{

System.out.println(c);

}

public static void main(String args[])

{

Main m=new Main();

m.a=10;

m.b=50;

        m.display(); }

}

Answer 1

The problem is that you set the value of a and b after you've created a new instance of Main, i.e. after the constructor is executed.

You should pass in the values of  a and b to the constructor:

public class Main
{
    int a;
    int b;
    int c;
    
    public Main(int _a, int _b)
    {
        a = _a;
        b = _b;
        c = a + b;
    }

    void display()
    {
        System.out.println(c);
    }

    public static void main(String args[])
    {
        Main m = new Main(10, 50);
        m.display();
    }
}

Note: I do not work with Java and it surprised me that you can define a constructor just by opening a new scope in the class without specifying the function name. Wow.