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# If...Then...Else Statement

Defines one or more statement blocks that you only want to execute if a given condition or expression is True.

### Syntax:

      If condition Then
          statements
      [{ElseIf} condition Then
          statements]
      [Else
          statements]
      {EndIf|End If}

Instead of End If you can write EndIf.

If statements can be shortened to one line when using single statement blocks.

      If condition Then statement [Else statement]

### Parameters:

The If...Then statement executes program blocks depending on given conditions. When LibreOffice Basic encounters an If statement, the condition is tested. If the condition is True, all subsequent statements up to the next Else or ElseIf statement are executed. If the condition is False, and an ElseIf statement follows, LibreOffice Basic tests the next expression and executes the following statements if the condition is True. If False, the program continues either with the next ElseIf or Else statement. Statements following Else are executed only if none of the previously tested conditions were True. After all conditions are evaluated, and the corresponding statements executed, the program continues with the statement following EndIf.

여러 If...Then 문을 중첩할 수 있습니다.

Else 및 ElseIf 문은 선택 사항입니다.

GoTo 및 GoSub를 사용하여 If...Then 블록 밖으로 나갈 수는 있지만 If...Then 구조 안으로 들어올 수는 없습니다.

### Example:

다음은 제품의 만료일을 입력한 다음 만료일이 경과했는지 확인하는 예입니다.

    Sub ExampleIfThenDate
        Dim sInput As String
        Dim dInput As Date

      On Error Goto inputError
        sInput = InputBox("Enter the expiration date (YYYY-MM-DD)")
        dInput = DateValue(sInput)

        If dInput < Date() Then
            MsgBox "The expiration date has passed"
        ElseIf dInput > Date() Then
            MsgBox "The expiration date has not yet passed"
        Else
            MsgBox "The expiration date is today"
        End If

    inputError:
        If dInput = 0 Then MsgBox "Invalid input"
    End Sub

관련 주제

Select Case statement

Iif or Switch functions

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