using System;
namespace ConsoleApplication_C_Sharp
{
class Program
{
static void Main(string[] args)
{
string[] array = { "c", "c++", "c#", "java" };
int i1 = Array.IndexOf(array, "c++");
Console.WriteLine(i1);
int i2 = Array.IndexOf(array, "python");
Console.WriteLine(i2);
}
}
}
/*
run:
1
-1
*/