driver code
let arr = [ 1 , 2 , 8 , 10 , 10 , 12 , 19 ] ; let n = arr . length ; let x = 3 ; let index = ceilSearch ( arr , 0 , n - 1 , x ) ; if ( index == - 1 ) document . write ( " " + x + " " ) ; else document . write ( " " + x + " " + arr [ index ] ) ;