# For...Next Statement

Repite as instrucións entre o bloque For... Next un número especificado de veces.

## Sintaxe: ``````
For counter=start To end [Step step]
bloque de instrucións
[Exit For]
bloque de instrucións
Next [counter]
`````` ``````
For Each item In list
bloque de instrucións
[Exit For]
bloque de instrucións
Next [item]
``````

## Variábeis:

counter: Loop counter initially assigned the value to the right of the equal sign (start). Only numeric variables are valid. The loop counter increases or decreases according to the variable step until end is passed.

start: Numeric variable that defines the initial value at the beginning of the loop.

end: Numeric variable that defines the final value at the end of the loop.

step: Sets the value by which to increase or decrease the loop counter. If step is not specified, the loop counter is incremented by 1. In this case, end must be greater than start. If you want to decrease counter, end must be less than start, and step must be assigned a negative value.

The For...Next loop repeats all of the statements in the loop for the number of times that is specified by the parameters.

As the counter variable is decreased, LibreOffice Basic checks if the end value has been reached. As soon as the counter passes the end value, the loop automatically terminates.

It is possible to nest For...Next statements. If you do not specify a variable following the Next statement, Next automatically refers to the most recent For statement.

If you specify an increment of 0, the statements between For and Next are repeated continuously.

When counting down the counter variable, LibreOffice Basic checks for overflow or underflow. The loop ends when counter exceeds end (positive Step value) or is less than end (negative Step value).

Use the Exit For statement to exit the loop unconditionally. This statement must be within a For...Next loop. Use the If...Then statement to test the exit condition as follows:

``````
For...
bloque de instrucións
If condition = True Then Exit For
bloque de instrucións
Next
`````` In nested For...Next loops, if you exit a loop unconditionally with Exit For, only one loop is exited.

## Exemplos

The following example uses two nested loops to sort a string array with 10 elements ( sEntry() ), that is filled with various contents:

``````
Sub ExampleSort
Dim sEntry(9) As String
Dim iCount As Integer, iCount2 As Integer
Dim sTemp As String
sEntry = Array("Jerry","Patty","Kurt","Thomas","Michael",_
"David","Cathy","Susie","Edward","Christine")
For iCount = 0 To 9
For iCount2 = iCount + 1 To 9
If sEntry(iCount) > sEntry(iCount2) Then
sTemp = sEntry(iCount)
sEntry(iCount) = sEntry(iCount2)
sEntry(iCount2) = sTemp
End If
Next iCount2
Next iCount
For iCount = 0 To 9
Print sEntry(iCount)
Next iCount
End Sub
``````

This explores the content of an array to display each item it contains.

``````
Sub list_iteration
cutlery = Array("fork", "knife", "spoon")
For Each item in cutlery
Print item
Next ' item
End Sub
``````

Precisamos da súa axuda!