Operators, Expressions and Type Conversion

Explanation

ABAP supports arithmetic, comparison, logical and string expressions. Modern ABAP also provides constructor operators such as VALUE, CONV, CORRESPONDING and COND. These make code shorter and more expressive, but incorrect type conversion can create subtle bugs. SAP business fields often have fixed lengths, conversion exits and domain rules. For example, material numbers and customer numbers may require leading-zero conversion. A developer should understand when implicit conversion is safe and when explicit conversion or correct typing is required.

Code example

DATA(lv_amount_text) = '1250.50'.DATA(lv_amount) = CONV wrbtr( lv_amount_text ). DATA(lv_status_text) = COND string(  WHEN lv_amount > 1000 THEN 'High value'  ELSE 'Normal value' ).

Real project scenario

An interface receives customer number as text without leading zeros. If the ABAP program compares it directly with KNA1-KUNNR, the record may not be found. Correct conversion or proper domain type handling is required.

Common mistakes

- Comparing character and numeric values without understanding conversion. - Ignoring leading-zero fields. - Using modern expressions in unreadable ways. - Assuming implicit conversion is always safe.

Best practices

- Use correct SAP data types. - Use CONV when conversion intent should be explicit. - Keep expressions readable. - Be careful with leading-zero fields.

Interview angle

Good candidates explain how type conversion affects SAP key fields and interface data.