Driver Code
public static void Main ( ) { int [ ] arr = { 10 , 3 , 5 , 6 , 20 } ; int n = arr . Length ; int max = maxProduct ( arr , n ) ; if ( max == - 1 ) Console . WriteLine ( " No ▁ Quadruple ▁ Exists " ) ; else Console . WriteLine ( " Maximum ▁ product ▁ is ▁ " + max ) ; } }