To/From Code

	Languages
BROWSEBYLANGUAGE Access VBA ASP Classic C# C++ C++/CLI Corel Paradox Delphi Delphi Prism Java JavaScript Perl PHP VB Classic VB.Net

	Categories
BROWSEBYCATEGORY +Tool Basics +Language Basics +Language Details +Data Structures +Statements +Operators +Commands +Database +OOP Basics +OOP Details

	Delphi Guides
Delphi To/From Conversion Guides Delphi and Access VBA Delphi and ASP Classic Delphi and C# Delphi and C++/CLI Delphi and Corel Paradox Delphi and Delphi Prism Delphi and Java Delphi and JavaScript Delphi and Perl Delphi and PHP Delphi and VB Classic Delphi and VB.Net

Cross Ref Guide

DELPHILANGUAGE

Delphi

DELPHIANDC++TOC

Overview

+Tool Basics

Report Tools Overview

+Language Basics

+Language Details

+Data Structures

Array

+Statements

+Operators

Empty String Check◄╣

+Commands

+OOP Basics

+OOP Details

	Members-Only
Sign in to see member-only pages.

► KB ► To/From Guides ► Delphi

Print This

Empty String Check (Delphi and C++ Cross Reference Guide)

By Mike Prestwood

Delphi versus C++: A side by side comparison between Delphi and C++.

Operators

A language symbol used for assignment, comparison, computational, or as a logical.

Empty String Check

[Other Languages]

Languages Focus

An empty string is a zero length string, a string that is equal to null (""), or not assigned. In some languages, you can check if a string is empty by comparing it to an empty string (""). Some languages distinguish between nil and null ("") so checking if the length is 0 is easier.

Delphi: length(s) = 0

Length() or SizeOf() will correctly identify an unassigned string variable or an empty string.

Syntax Example:

if length(s) = 0 then
  ShowMessage('empty string');

[Not specified yet. Coming...]