DO: First Statement of a standard Loop

Start index, end index and step size can be controlled by the loop parameters. This is in contrast to HicEst inline-loops or EDIT-loops.

• The DO loop controls the repeated execution of a block of statements or constructs
• The loop variable loopvar is set to loopstart to loopend in steps of loopstep (default is 1):
• loopstart, loopend, and loopstep are numerical values or expressions
  • DO loopvar = loopstart, loopend, loopstep ! loopstep=1 can be omitted
  • ! ... block of statements or constructs
  • ENDDO ! the terminating statement of a DO loop
• Alternatively, a DO loop can be written with a terminating label (e.g. 999):
  • DO 999 loopvar = loopstart, loopend, loopstep ! loopstep=1 can be omitted
  • ! ... block of statements or constructs
  • 999 CONTINUE
  This allows a GOTO to the last (non executable) CONTINUE statement. This is not recommended, better is to use an IF construct.
• There are simple loop operations, that can be programmed more efficiently by array operations.
• For many repetitive array and string operations InlineLoop programming creates an efficient single line statement
• EDIT provides another single line loop possibility
• To exit a loop prematurely a RETURN, GOTO, or a function error exit can be programmed
• ⇾ programming (execution control)