What does a formatted string means? And what is it's function?

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int x = 10;
double y = 20;
Console.WriteLine("x = {0}; y = {1}", x, y);
}
}
}

Answer 1

See SoloLearn's C# course at 'Basic concepts', 'Printing text', lesson 2.

Answer 2

When you output a string with Console, you can replace placeholders by variable value to format your string.
In your example {0} will be replaced by the value of the first variable after ',' (your variable is x, value of x is 10 - {0} will be replaced by 10).
{1} will be replaced by the value of the second variable (your second variable is y, value of y is 20 - {1} will be replaced by 20).

Answer 3

not sure about c#, but in java they have a printf function
System.out.printf("put a number here: %d",x);
where x is an integer.
it will take the parameters and fill them in left to right in the string argument.
i assume it works the same way, just not sure the exact way.

Answer 4

Thank you so much!

Answer 5

That's why i came here,it doesn't explain what a formatted string means