# do

Evaluate expression/s some number of times

do[count;e1;e2;e3;…;en]

Control construct. Where

• count is a non-negative integer
• e1, e2, … en are expressions

the expressions e1 to en are evaluated, in order, count times.

The result of do is always the generic null.

Continued fraction for $$\pi$$, for 7 steps:

q)r:()
q)t:2*asin 1
q)do[7;r,:q:floor t;t:reciprocal t-q]
q)r
3 7 15 1 292 1 1

do is not a function but a control construct. It cannot be iterated or projected.

## Name scope

The brackets of the expression list do not create lexical scope. Name scope within the brackets is the same as outside them.