code problem

Question

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

namespace ConsoleApp1
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            int x = 90;
            int y = 23;
            int z = x + y;
            Console.WriteLine("X IS : {0}\n Y IS : {1}\n Z IS {3}", x, y, z);    




        }
    }
}

this is my code but when i run it

i getting an error

ike this:

Unhandled Exception: System.FormatException: Input string was not in a correct format.
   at System.Text.StringBuilder.AppendFormatHelper(IFormatProvider provider, String format, ParamsArray args)
   at System.String.FormatHelper(IFormatProvider provider, String format, ParamsArray args)
   at System.IO.TextWriter.WriteLine(String format, Object arg0, Object arg1, Object arg2)
   at System.IO.TextWriter.SyncTextWriter.WriteLine(String format, Object arg0, Object arg1, Object arg2)
   at System.Console.WriteLine(String format, Object arg0, Object arg1, Object arg2)
   at ConsoleApp1.Program.Main(String[] args) in F:\vscode\ConsoleApp1\ConsoleApp1\Program.cs:line 16

how should i sloved this problem?

Answer 1

The param {3} should had been {2}

Try this

int x = 90;
int y = 23;
int z = x + y;
Console.WriteLine($"X IS : {x}\n Y IS : {y}\n Z IS {z}");

Or

int x = 90;
int y = 23;
int z = x + y;
Console.WriteLine("X IS : {0}\n Y IS : {1}\n Z IS {2}", x, y, z);

Answer 2

The error in this code is in the last line where you are trying to format the output string using "{3}" as a placeholder for the third argument.

The correct syntax for the placeholders is to use zero-based indices starting from 0. Therefore, the third argument should be referenced using "{2}" instead of "{3}".

Here's the corrected code:

int x = 90;
int y = 23;
int z = x + y;

Console.WriteLine("X IS : {0}\n Y IS : {1}\n Z IS {2}", x, y, z);