How to i find the largest number of a group of numbers

Question

I want find the largest number of a group of numbers but i don't want use any pre defined methods.

Answer 1

Hint :
Use for loop.
Each iteration compare the values.
Use index value.

Answer 2

using System.Linq;
...

int maxValue = anArray.Max();
int maxIndex = anArray.ToList().IndexOf(maxValue);