55 lines
1.4 KiB
Markdown
55 lines
1.4 KiB
Markdown
---
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title: While Loop
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---
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# While Loop
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The while loop executes a block of code until a specified condition is false. Because the test of the while expression takes place before each execution of the loop, a while loop executes zero or more times. This differs from the do loop, which executes one or more times because the test of the expression takes place after the execution of the loop.<sup>1</sup>
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## Example
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```csharp
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int i = 0;
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while (i < 5)
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{
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Console.WriteLine("Number " + i);
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i++;
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}
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```
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### Output:
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```
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> Number 0
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> Number 1
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> Number 2
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> Number 3
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> Number 4
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```
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## Other Uses
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The while loops is often used for infinite iterrations by using (for example) `while (true)`, only to be ended through a condition unrelated to the initial condition of the loop.
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```csharp
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int i = 0;
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while (true)
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{
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if(i<50){
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Console.WriteLine("Number " + i);
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i++;
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}
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else{
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Console.WriteLine("End of loop");
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break;
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}
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}
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```
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## Differences to the `for` loop
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The biggest differences between the `for` and `while` loops is that `while` is typically used when a developer is not sure of an exact number of iterations of the loop, and `for` is used when it's clear how many times to iterate through code.
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### Sources
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* [Microsoft C# - while](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/while)
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