Editing FOCAL (programming language) (section)

====DO====
The {{code|DO}} command (abbreviation D) branches execution to a subroutine. It is the equivalent of BASIC's {{code|GOSUB}}. The subroutine is referenced either by group number or line number. If a line number is provided, that single line is run and then automatically returns to continue execution at the statement after the {{code|DO}}. If no line number is provided, execution starts at the first line of the block and continues until the end of the block is reached. {{code|RETURN}} is supported, but is only required to return early from the group, it is not needed at the end of the group.{{sfn|Manual|1968|p=3.4}}
 01.15 DO 7.24
 01.16 DO 8