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So what's the difference between a two-dimensional array, and a single-dimensional array of single-dimensional arrays? When to use which?

13th May 2016, 6:28 AM
Mohamed Matough
Mohamed Matough - avatar
2 Respostas
+ 5
As the tutorial states: A jagged array is an array-of-arrays, so an int[ ][ ] is an array of int[ ], each of which can be of different lengths and occupy their own block in memory. A multidimensional array (int[,]) is a single block of memory (essentially a matrix). It always has the same amount of columns for every row.
20th May 2016, 1:08 PM
James Flanders
+ 1
Hello. Think he means that int[,] array = new int[2,2] and int[][] jaggedArray = new int[2][2] are almost the same. But have some differences in using. You can look at the example below //2Dimensional array int[,] array = new int[2, 2]; //set for (int i = 0; i < 2; i++) { for (int j = 0; j < 2; j++) array[i, j] = i * j + 1; } //get Console.WriteLine("2Dimensional"); for (int i = 0; i < 2; i++) { for (int j = 0; j < 2; j++) Console.Write(array[i, j] + " "); Console.WriteLine(); } //Jagged array int[][] jaggedArray = new int[2][] { new int[2], new int[2] }; //set Console.WriteLine("Jagged"); for (int i = 0; i < 2; i++) { for (int j = 0; j < 2; j++) jaggedArray[i][j] = i * j + 1; } //get for (int i = 0; i < 2; i++) { for (int j = 0; j < 2; j++) Console.Write(jaggedArray[i][j] + " "); Console.WriteLine(); } Console.WriteLine("Arrays are equal: " + array.Equals(jaggedArray)); Console.WriteLine("2 Dimentional array has length = " + array.Length); Console.WriteLine("Jagged array has length = " + jaggedArray.Length); for (int i = 0; i < 2; i++) { Console.WriteLine(i + 1 + " array in Jagged array has length = " + jaggedArray[i].Length); } Console.WriteLine("2 Dimentional array has rank = " + array.Rank); Console.WriteLine("Jagged array has rank = " + jaggedArray.Rank); for (int i = 0; i < 2; i++) { Console.WriteLine(i + 1 + " array in Jagged array has rank = " + jaggedArray[i].Rank); } Console.ReadKey(); //Outputs //2Dimensional //1 1 //1 2 //Jagged //1 1 //1 2 //Arrays are equal: False //2 Dimentional array has length = 4 //Jagged array has length = 2 //1 array in Jagged array has length = 2 //2 array in Jagged array has length = 2 //2 Dimentional array has rank = 2 //Jagged array has rank = 1 //1 array in Jagged array has rank = 1 //2 array in Jagged array has rank = 1
3rd Oct 2016, 11:08 AM
Roman Wood
Roman Wood - avatar