I didnt undstand x={0} e y ={1}

Answer 1

They are placeholders for the variables, see example below.

string name = "Malachi";
int age = 24;
Console.WriteLine("My name is {0}, and my age is {1}", name, age);

This will result in; My name is Malachi, and my age is 24

{0} is replaced with the variable called "name"
{1} is replaced with the variable called "age"

Hope this helps!

Answer 2

int x=10 is OK but if we use int y=20 instead and using double ,is there is any problem? if we use int it is 1cycles/ executions so time consumption is also less

Answer 3

It is a parameter replacement. {0} is replaced with the contents of the first variable, etc.

Answer 4

They are variable placeholders. That is what the {0} and {1} stand for.

Answer 5

You can also do this:

string name = "Malachi";
int age = 24;
Console.WriteLine("My name is " + name + "and my age is " + age);

Answer 6

So we can put anything on the placeholder?

Answer 7

So basiscally int a IS EQUAL TO {0} int b === {1} etc etc