Declare variables:
int arr[100], n, key, i, found=0

Input number of elements (n)

Input n elements into array

Input element to search (key)

Set i = 0, found = 0

Is i < n?

Is arr[i] == key?

Set found = 1
Print position (i+1)
Break loop

i = i + 1

Is found == 1?

Print "Not found"