A simple repetitive loop is a repetitive loop in which the repetitor phrase is an expression that evaluates to a count of the iterations.

If repetitor is omitted but there is a conditional or if the repetitor is FOREVER, the group of instructions is processed until the condition is satisfied or a Rexx instruction ends the loop (for example, LEAVE).

In the simple form of a repetitive loop, exprr is evaluated immediately (and must result in a positive whole number or zero), and the loop is then processed that many times.

/* This displays "Hello" five times */
Loop 5
say "Hello"
end

Note that, similar to the distinction between a command and an assignment, if the first token of exprr is a symbol and the second token is (or starts with) =, the controlled form of repetitor is expected.