input c#

Question

static void Main(string[] args)
{
String name;
int age;
double grade;

Console.WriteLine("what is your name");
name = Console.ReadLine();
Console.WriteLine("may name is {0}",name);

Console.WriteLine("how old are you");
age = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Im {1}", age);

Console.WriteLine("my grade");
grade = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("my grade {2}", grade);

}

(((
why double variable not appear ?? and other two variable are appeare((

Answer 1

hi sanaa Hareb
whats the output of that code....

Answer 2

the output :
what is your name
Ali
my name is Ali

how old are you
28

but for double variable writen unhandle exception

Answer 3

hi Sanaa Hareb
here a fixed version of your code. the exception in your code was caused by age and grade lines...
https://code.sololearn.com/cFv3QsSjyUJ9/?ref=app
Console.WriteLine(“my grade {2}”, grade);
this is because if you want to print grade to the screen it needs to be zero and putting it as 2 prints null to the screen and causes an error

Answer 4

Do you know for what use is {number}?
{0} means that it will take first variable that appears after comma in console.writeline
{1} means that it will take second variable that appears after comma in console.writeline
{2} means that it will take third variable that appears after comma in console.writeline
...

Console.Writeline("I'm printing {0}{1}{2}", first,second,third);

If you have obe parameter in cw, you don't need that, only if you want to print in another order then use it.
👌👌👌

Answer 5

those {n} indicates the function to replace it with the n+2 parameters. assuming the first parameter (the string) is 1.

since syntax is {2} (the 4th parameter) and {1} (the 3rd parameter) but theres only 2 parameters. the function will try to find the value that doesnt exist.