{"id":264,"date":"2022-01-02T08:37:40","date_gmt":"2022-01-02T01:37:40","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=264"},"modified":"2022-06-03T13:28:31","modified_gmt":"2022-06-03T06:28:31","slug":"csharp-passing-array-to-function","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-tutorial\/csharp-passing-array-to-function\/","title":{"rendered":"C# Passing an Array to a Function"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn how to pass an array to a function as an argument.<\/p>\n\n\n\n

Passing an array to a function as an argument<\/h2>\n\n\n\n

To pass an array<\/a> to a function, you specify the array parameter with the following syntax:<\/p>\n\n\n

type [] arrayParameter<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
The following illustrates how to pass an array to a function:<\/p>\n\n\n
void<\/span> PrintArray<\/span>(decimal<\/span>[] elements<\/span>)<\/span>\n{\n    foreach<\/span> (var<\/span> element in<\/span> elements)\n    {\n        Console.WriteLine($\"{element:0.<\/span>##}<\/span>\"<\/span>);\n    }\n}\n\n\ndecimal<\/span>[] salaries = { 100000<\/span>, 120000<\/span>, 150000<\/span> };\n\nPrintArray(salaries);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
100000<\/span>\n120000<\/span>\n150000<\/span><\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
How it works.<\/p>\n\n\n\n
First, define a function called PrintArray()<\/code> that outputs the elements of an array to the console:<\/p>\n\n\n
void<\/span> PrintArray<\/span>(decimal<\/span>[] elements<\/span>)<\/span>\n{\n    foreach<\/span> (var<\/span> element in<\/span> elements)\n    {\n        Console.WriteLine($\"{element:0.<\/span>##}<\/span>\"<\/span>);\n    }\n}<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this PrintArray()<\/code> function, we use the foreach<\/code> statement to iterate over the elements of the array and output each of them to the console.<\/p>\n\n\n\n
Second, declare a decimal array and initialize it with some values:<\/p>\n\n\n
decimal<\/span>[] salaries = { 100000<\/span>, 120000<\/span>, 150000<\/span> };<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Third, pass the salaries array to the PrintArray()<\/code> function:<\/p>\n\n\n
PrintArray(salaries);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Note that you can initialize and pass a new array to the function in one step like this:<\/p>\n\n\n
PrintArray(new<\/span> decimal<\/span>[]{ 100000<\/span>, 120000<\/span>, 150000<\/span> });<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Changing the array elements<\/h2>\n\n\n\n
Because arrays are reference types, the function can change the values of their elements. For example:<\/p>\n\n\n
void<\/span> PrintArray<\/span>(decimal<\/span>[] elements<\/span>)<\/span>\n{\n    foreach<\/span> (var<\/span> element in<\/span> elements)\n    {\n        Console.WriteLine($\"{element:0.<\/span>##}<\/span>\"<\/span>);\n    }\n}\n\nvoid<\/span> Increase<\/span>(decimal<\/span>[] salaries, decimal<\/span> percentage = 0.05<\/span>m<\/span>)<\/span>\n{\n    for<\/span> (int<\/span> i = 0<\/span>; i < salaries.Length; i++)\n    {\n        salaries[i] = salaries[i] * (1<\/span> + percentage);\n    }\n}\n\ndecimal<\/span>[] salaries = { 100000<\/span>, 120000<\/span>, 150000<\/span> };\n\nConsole.WriteLine(\"Before increment:\"<\/span>);\nPrintArray(salaries);\n\nIncrease(salaries);\n\nConsole.WriteLine(\"After increment:\"<\/span>);\nPrintArray(salaries);\n<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
Before increment:\n100000\n120000\n150000\nAfter increment:\n105000\n126000\n157500<\/code><\/span>Code language:<\/span> plaintext<\/span> (<\/span>plaintext<\/span>)<\/span><\/small><\/pre>\n\n\n
How it works.<\/p>\n\n\n\n
First, define the Increase()<\/code> function that increases the elements of salaries<\/code> array by a percentage. By default, the percentage is 5% (or 0.05):<\/p>\n\n\n
void<\/span> Increase<\/span>(decimal<\/span>[] salaries, decimal<\/span> percentage = 0.05<\/span>m<\/span>)<\/span>\n{\n    for<\/span> (int<\/span> i = 0<\/span>; i < salaries.Length; i++)\n    {\n        salaries[i] = salaries[i] * (1<\/span> + percentage);\n    }\n}<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Next, declare and initialize an array of salaries:<\/p>\n\n\n
decimal<\/span>[] salaries = { 100000<\/span>, 120000<\/span>, 150000<\/span> };<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Then, output the elements of the salaries<\/code> array using the PrintArray()<\/code> function:<\/p>\n\n\n
Console.WriteLine(\"Before increment:\"<\/span>);\nPrintArray(salaries);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
After that, pass the salaries<\/code> array to the Increase()<\/code> function:<\/p>\n\n\n
Increase(salaries);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Finally, output the elements of the salaries<\/code> array to the console:<\/p>\n\n\n
Console.WriteLine(\"After increment:\"<\/span>);\nPrintArray(salaries);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
Summary<\/h2>\n\n\n\n
  • Arrays are reference types, functions can change the values of the array elements.<\/li><\/ul>\n
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