Index of 8 or -1.
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using System;
class Program
{
static void Main()
{
int[] arr = { 1, 2, 3, 4, 5, 6, 7, 8 }; int target = 8;
int idx = -1;
for (int j = 0; j < arr.Length; j++) if (arr[j] == target) { idx = j; break; }
Console.WriteLine(idx);
}
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