how i find a index of element in a array ?

Try this:

using System;

class Program

{

static void Main()

{

string[] planets = {"mercury", "venus", "earth", "mars", "saturn", "jupiter", "uranus", "neptune", "pluto"};

Console.WriteLine();

while(true)

{

Console.Write("Choose a planet or Sun to finish : ");

string planet = Console.ReadLine().ToLower();

if (planet == "sun") return;

int index = Array.IndexOf(planets, planet);

planet = Char.ToUpper(planet[0]) + planet.Substring(1);

if (index >= 0)

{

Console.WriteLine("{0} is at index {1}", planet, index);

}

else

{

Console.WriteLine("{0} isn't included in the array", planet);

}

Console.WriteLine();

}

2 Replies

Know the answer? Post it — somebody with the same question will find it here.