Driver method to test above
public static void Main ( ) { int [ ] arr = { 2 , 3 , 4 , 10 , 40 } ; int n = arr . Length ; int x = 10 ; int result = binarySearch ( arr , 0 , n - 1 , x ) ; if ( result == - 1 ) Console . WriteLine ( " Element ▁ not ▁ present " ) ; else Console . WriteLine ( " Element ▁ found ▁ at ▁ index ▁ " + result ) ; } }