Why it is necessary to put "+"after x and before y to display correct output. Via writeLine method ?

Question

int x = 3;
int y = x--;
Console.WriteLine(x+" "+y);

Answer 1

Because you're adding the values together to create the output string. An alternative would be Console.WriteLine("{0} {1}", x, y);. In this case you use the formatting of strings to generate the output. (Also found under string.Format(...);)

Answer 2

In the above expression +" " concatinate the space between x and y.