# while

Begins a loop construct.

## Syntax

while(`expr`)

## Input

- expr
- A mathematical expression. If
`expr`evaluates to zero, the expression is false, the loop terminates and the instruction following endloop is executed. If`expr`evaluates to any other value, the expression is true and the instructions between while and endloop are executed.

## Example

```
{
i = 0;
while(i < 5);
i; cr();
i++
endloop
}
```

```
0
1
2
3
4
```

## Comments

Every while loop must be terminated with an endloop statement.