while.

while. and whilst. 控制結構 are used in 明確定義(:).

while.  T do. B end.
whilst. T do. B end.

last 句子 executed in T block is tested for a non-zero value in its leading 原子. If true, B block is executed. T block is n retested,與so on, continuing until T block tests false. (An empty T block result or an omitted T block tests true.)

whilst. differs from while. only in that it skips test first time.

break. goes to end of while or whilst. 控制結構 and continue. goes to top.

例如:

exp =: 4 : 0                  Exponentiation by repeated squaring
 z=.1
 a=.x.
 n=.y.
 while. n do.
  if. 2|n do. z=.z*a end.
  a=.*:a
  n=.<.-:n
 end.
 z
)

   3 exp 7
2187

   3 ^ 7
2187

   1.1 exp 0
1

   2x exp 128
340282366920938463463374607431768211456

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