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SET BIT  Syntax Diagram

Short Reference

Syntax

SET BIT bitpos OF byte_string [TO val].

Effect

This statement sets the bit in bit position bitpos of the variable byte_string to 1 or, if specified, to the value of data object val. The other bits in byte_string remain unchanged.

The data object byte_string must be byte-like, whereas bitpos and val are numerical expression positions of operand type i. The value of bitpos must be greater than 0 and val must be either 0 or 1. Otherwise an exception that cannot be handled is raised. The bit positions in byte_string are counted from the beginning of the data object. If the value of bitpos is greater than the number of bits in byte_string, no bit is replaced and sy-subrc is set to 4.

System Fields

sy-subrc Meaning
0 A bit in data object byte_string was set at position bitpos.
4 The value of bitpos is greater than the number of bits in byte_string, therefore no bit was set.

Notes

Example

In the data object hex with eight bits, the bit is set to the value 1 at the position determined by the loop counter sy-index, with all other bits set to 0. The output is "80 40 20 10 08 04 02 01".

DATA hex        TYPE x LENGTH 1.
DATA output TYPE string.
DO 8 TIMES.
  CLEAR hex.
  SET BIT sy-index OF hex.
  output = output && |{ hex } |.
ENDDO.
cl_demo_output=>display( output ).

Exceptions

Non-Catchable Exceptions