27. C# (Arrays)

Full Runnable Code using System ; class Program { static void Main () { // 1) Declare + allocate (check default values) int [] numbers = new int [ 3 ]; Console . WriteLine ( "Default values:" ); Console . WriteLine ( numbers [ 0 ]); Console . WriteLine ( numbers [ 1 ]); Console . WriteLine ( numbers [ 2 ]); Console . WriteLine (); // 2) Update values numbers [ 0 ] = 10 ; numbers [ 1 ] = 20 ; numbers [ 2 ] = 30 ; Console . WriteLine ( "After updates:" ); for ( int i = 0 ; i < numbers . Length ; i ++) { Console . WriteLine ( numbers [ i ]); } Console . WriteLine (); // 3) Index from End (^) int [] numbers2 = { 10 , 20 , 30 , 40 , 50 }; Console . WriteLine ( "Access from the end:" ); Console . WriteLine ( numbers2 [^ 1 ]); // 50 Console . WriteLine ( numbers2 [^ 2 ]); // 40 Console . WriteLine (); // 4) Sum all values int sum = 0 ; for ( int i = 0 ; i < numbers2 . Length ; i ++) { sum += numbers2 [ i ]; } Console . WriteLine ( "Sum:" ); Console . WriteLine ( sum ); Console . ReadKey (); }