Confuse because of formattingin C#

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I basically started from C++ now in C#,I find formatting confusing.

C#

Console.WriteLine("Number of command line parameters = {0}",
           args.Length);

In above code {0} has been used,this prints out the length of command line args array.
But this work differenetly with {1},see following code.

C#

for (int i = 0; i < args.Length; i++)
        {
            Console.WriteLine("Arg[{0}] = [{1}]", i, args[i]);
        }

output of above code is:

Number of command line parameters = 5
Arg[0] = [abc]
Arg[1] = [def]
Arg[2] = [ghi]
Arg[3] = [klm]
Arg[4] = [nop]

What I want to know is how {0} prints indexes but {1} prints values stored in relevent indexes.

Posted 11-Dec-13 19:36pm

Labeeb Ahmad

Updated 11-Dec-13 19:39pm

v3

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2 solutions

Solution 2

Question : What I want to know is how {0} prints indexes but {1} prints values stored in relevent indexes.?

Answer: Because index o refers to loop control variable i, so it aways print loop count like 0,1,2,3,4..etc.,

index 1 refers to the args[i] means -> args[0],args[1],args[2] etc., as args[i] contains command line argument value ,so it prints abc , def ...etc.,

Posted 11-Dec-13 20:57pm

Sudhakar Tillapudi

Updated 11-Dec-13 20:58pm

v2

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OriginalGriff · Accepted Answer · 2013-12-11T20:39:00

Because the number inside the { and } within the format string is the index to the following parameters:

Console.WriteLine("{0}:{1}:{2}", a, b, c);
                    ^   ^   ^
                    |   |    -- parameter 2: 'c'
                    |    ------ parameter 1: 'b'
                     ---------- parameter 0: 'a'

It's a way of tieing parameters to positions within the resulting string - they don't have to be in numerical order, or even different!

Console.WriteLine("{1}:{0}:{2}", a, b, c);
Console.WriteLine("{0}:{1}:{0}", a, b)

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