Some knowledge points about SAP ABAP string variables that are easy to ignore and confuse

Directory of zero-based ABAP learning tutorial series articles

• One of the BC400 study notes of the ABAP standard training course: the architecture of the ABAP server and an introduction to the structure of a typical ABAP program
• ABAP Standard Training Course BC400 Study Notes II: The Difference Between Cross-client and Client-specific
• ABAP Standard Training Course BC400 Study Notes No. 3: Features and Basic Elements of ABAP Programming Language
• ABAP Standard Training Course BC400 Study Notes No. 4: Data Types of ABAP Programming Language
• ABAP Standard Training Course BC400 Study Notes No. 5: Variables, Constants and Literals of the ABAP Programming Language, and Text Symbols

ABAP Basics

• Through practical examples, introduce the use skills of Repository Information System in SAP ABAP
• The use of ABAP function module
• Definition and use of ABAP subroutine
• Variables and Constants in ABAP
• System Fields in the ABAP programming language
• What is ABAP Field Symbol
• Introduction to ABAP Reference Types
• An introduction to the use of the ABAP debugger in the most easy-to-understand SAPGUI
• How to create the simplest ABAP database table, and code to read data from the database table (on)
• How to create the simplest ABAP database table and code to read data from the database table (below)
• Read local text file content with ABAP
• Create a new local Excel file with ABAP and write data
• 26 lines of ABAP code use the HTTP_GET function to download the homepage data of the Baidu website
• How ABAP parses JSON data
• How to copy an ABAP class from a local file to the SAP system
• A First Look at Object-Oriented ABAP Programming - What Are Classes, Instances, and Public Methods
• User input functionality for SAP ABAP reports
• Use ABAP transaction code SM59 to create a Destination to read data from the external network
• Through a specific example, explain the use steps of SAP BDC technology
• Starting from interpreting the code automatically generated by BDC, explain the program components of SAPGUI
• How to query the database table storage corresponding to a field on the SAPGUI screen
• How to use transaction code SAT to find the name of the background storage database table corresponding to a SAPGUI screen field
• Step-by-step detailed steps to create an ABAP program with a custom Screen

ALV Development Topics

• 27 lines of code to develop a simplest SAP ALV report
• 48 lines of code to add color effects to the data rows of the ABAP ALV report
• 77 lines of code to implement double-click event processing in ABAP ALV

This step is the follow-up of this tutorial article ABAP Standard Training Course BC400 Study Notes: Variables, Constants and Literals of the ABAP Programming Language, and Text Symbols .

ABAP variables of type string, which seem easy to use.

The following code defines a variable of type string, assigns it to Jerry, and prints it.

 REPORT z.

DATA: lv_string TYPE string.

lv_string = 'Jerry'.

WRITE:/ lv_string.

Can you tell me the output of the following two lines of print statements? Here strlen is the ABAP standard function used to calculate the length of the input string, that is, the number of characters.

 DATA: lv_string1 TYPE string,
      lv_string2 type string.

lv_string1 = ' a '.
lv_string2 = ` a `.

WRITE:/ strlen( lv_string1 ), strlen( lv_string2 ).

The answers are 2 and 3.

Refer to this link for a detailed explanation.