Answer / anandraj

class Program
{





void add()
{
int x = 10, y = 20,sum;
fun(x,y,out sum);//changing the parameters
Console.WriteLine("{0}", sum);

}

void fun(int x,int y,out int sum)//changing the
parameter and using out keyword
{

sum = x + y;

}
static void Main(string[] args)
{
Program f = new Program();
f.add();

}

Answer / simhachalam

Actually you defined x,y variable in add() function so that
variables you can't access outside of method .finally u got
error is undefined variables x,y.

Answer / nvk

The Variable Sum Is Not defined

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