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# while

X3 programming language, the "while" keyword is used to create a loop that continues to execute a block of code as long as a specified condition is true. Here's how you would use the "while" keyword in your X3 language:

#### Basic Usage:

```x3
var count = 0

# Using 'while' loop to execute code while a condition is true
while count < 5 then
    show(count)
    count = count + 1
end
```

#### Explanation:

* In this example, the "while" loop continues to execute the code block as long as the condition `count < 5` is true.
* The loop variable `count` starts at 0 and increments by 1 in each iteration until it reaches 5.

#### Infinite Loop:

```x3
# Using 'while' loop to create an infinite loop
var i = 0
while true then
    show(i)
    i = i + 1
    if i >= 5 then
        break
    end
end
```

#### Explanation:

* Here, the "while" loop condition is always true, creating an infinite loop.
* Inside the loop, `i` is incremented by 1 in each iteration, and the loop stops when `i` reaches 5 using the "break" keyword.

#### Using with Input:

```x3
# Using 'while' loop with user input
var userInput = 0
while userInput != 5 then
    userInput = input("Enter a number (5 to exit): ")
    show("You entered: {userInput}")
end
```

#### Explanation:

* This example demonstrates using a "while" loop with user input.
* The loop continues to prompt the user to enter a number until they enter 5, at which point the loop exits.

#### Nested Loops:

```x3
# Nested 'while' loops
var i = 0
while i < 3 then
    var j = 0
    while j < 2 then
        show("({i}, {j})")
        j = j + 1
    end
    i = i + 1
end
```

#### Explanation:

* In this example, a nested "while" loop is used to create a grid-like structure.
* The outer loop iterates over the values of `i`, and for each iteration of `i`, the inner loop iterates over the values of `j`.

By incorporating the "while" keyword in your X3 language, you provide users with the ability to execute code repeatedly based on a specified condition, allowing for flexible and dynamic looping behavior in their programs.