Explain about Constants, Text Symbols, Selection Texts and Variants in SAP ABAP.

 Explain about Constants, Text Symbols, Selection Texts and Variants?

Constants:

-They are used to avoid the hard coded text in the programs and improve the reusability in the program. The ABAP statement ‘CONSTANTS’ is used to define constants.

Text Symbols: 

- The ABAP Statement TEXT followed by the symbol number (XXX) can used to define or call the text symbol.

Selection texts:

 - They are used to maintain the Field labels (descriptions) of the input fields of the selection screen. The T-code SE63 is used to translate the text elements.

Variants: 

- They are used to save the input data for further execution in the selection screen. They can also be used to avoid the data entry errors & schedule a program in the back ground.