Driver program to test the above function
public static void Main ( ) { int [ ] arr = { 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 10 } ; int n = arr . Length ; Console . Write ( " smallest ▁ Missing ▁ element ▁ is ▁ : ▁ " + findFirstMissing ( arr , 0 , n - 1 ) ) ; } }