Introduction to common use of arrays in asp.net C #

Example

The code is as follows:

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Using System; Class ArrayApp { Public static void Main ()  { // One-dimensional array usage: calculates the number of odd and even numbers in the array Console. WriteLine ("one-dimensional array demonstration: number of parity in one-dimensional array "); Int [] arr1 = new int [] {8, 13, 36, 30, 9, 23, 47, 81 }; Int odd = 0; Int even = 0; Foreach (int I in arr1)   { If (I % 2 = 0) Even ++; Else Odd ++;   } Console. WriteLine ("There are {0} even numbers and {1} odd numbers. ", Even, odd ); // Two-dimensional array usage: matrix of n columns in m rows Console. WriteLine ("two-dimensional array demonstration: 3 rows and 4 columns matrix "); Int [,] arr2 = new int }}; For (int I = 0; I <3; I ++)   { For (int j = 0; j <4; j ++)    { Console. Write (arr2 [I, j] + "\ t ");    } Console. WriteLine ();   } // Usage of a jagged array: two arrays with different numbers of elements Console. WriteLine ("demo of a jagged array: two arrays with different lengths "); Int [] [] arr3 = new int [2] []; Arr3 [0] = new int [5] {1, 3, 5, 7, 9 }; Arr3 [1] = new int [4] {2, 4, 6, 8 }; // Char [] [] arr3 = new char [] [] {H, e, l, l, o}, {C, s, h, a, r, p }}; For (int I = 0; I <arr3.Length; I ++)   { Console. Write ("The {0} array is \ t", I + 1 ); For (int j = 0; j <arr3 [I]. Length; j ++)    { Console. Write (arr3 [I] [j] + "\ t ");    } Console. WriteLine ();   }  } }

Usage of pass-out values

The array is int [] testArray = {4, 7, 4, 2, 7, 3, 7, 8, 3, 9, 1, 9}; the maximum value is 9, the storage locations are 9 and 11.

The code is as follows:

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Using System; Using System. Collections. Generic; Using System. Linq; Using System. Text; Using System. Diagnostics; Namespace Ch07Ex01 { Class Program     { Static void Main (string [] args)         { Int [] testArray = {4, 7, 4, 2, 7, 3, 7, 8, 3, 9, 1, 9 }; Int [] maxValIndices; Int maxVal = Maxima (testArray, out maxValIndices ); Console. WriteLine ("Maximum value {0} found at element indices :", MaxVal ); Foreach (int index in maxValIndices)             { Console. WriteLine (index );             } Console. ReadKey ();         } Static int Maxima (int [] integers, out int [] indices)         { Debug. WriteLine ("Maximum value search started ."); Indices = new int [1]; Int maxVal = integers [0]; Indices [0] = 0; Int count = 1; Debug. WriteLine (string. Format ( "Maximum value initialized to {0}, at element index 0.", maxVal )); For (int I = 1; I <integers. Length; I ++)             { Debug. WriteLine (string. Format ("Now looking at element at index {0 }.", I )); If (integers [I]> maxVal)                 { MaxVal = integers [I]; Count = 1; Indices = new int [1]; Indices [0] = I; Debug. WriteLine (string. Format ( "New maximum found. New value is {0}, at element index {1 }.", MaxVal, I ));                 } Else                 { If (integers [I] = maxVal)                     { Count ++; Int [] oldIndices = indices; Indices = new int [count]; OldIndices. CopyTo (indices, 0 ); Indices [count-1] = I; Debug. WriteLine (string. Format ( "Duplicate maximum found at element index {0}.", I ));                     }                 }             } Trace. WriteLine (string. Format ( "Maximum value {0} found, with {1} occurrences.", maxVal, count )); Debug. WriteLine ("Maximum value search completed ."); Return maxVal;         }     } }

Debug. writeline is used to display the debugging result in the output window of the interrupt mode.