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In computer programming, foreach loop (or for-each loop) is a control flow statement for traversing items in a collection. foreach is usually used in place of a standard for loop statement . Unlike other for loop constructs, however, foreach loops [ 1 ] usually maintain no explicit counter: they essentially say "do this to everything in this ...
Foreach loops; While loops; For loops; ... Windows PowerShell — — — — — — OCaml — — ... "PIC S9999", for example, would require a signed variable of ...
; LineComment one example (most assembly languages use line comments only) AutoHotkey; LineComment /* BlockComment */ AWK, Bourne shell, C shell, Maple, PowerShell # LineComment <# BlockComment #> Bash # LineComment <<EOF BlockComment EOF: ' BlockComment ' BASIC (various dialects): 'LineComment (not all dialects) *LineComment (not all dialects)!
(with-hash-table-iterator (entry-generator phone-book) (loop do (multiple-value-bind (has-entry key value) (entry-generator) (if has-entry (format T "~&~s => ~s" key value) (loop-finish))))) It is easy to construct composite abstract data types in Lisp, using structures or object-oriented programming features, in conjunction with lists, arrays ...
For example, to perform an element by element sum of two arrays, a and b to produce a third c, it is only necessary to write c = a + b In addition to support for vectorized arithmetic and relational operations, these languages also vectorize common mathematical functions such as sine. For example, if x is an array, then y = sin (x)
Shell, scripting: Yes Yes No Yes No No Several variants, custom programmable, dynamic loadable modules Optionally POSIX.2 [13] LabVIEW (G) Application, industrial instrumentation-automation Yes Yes Yes No No No Dataflow, visual: No Lisp: General No No Yes No No No Unknown LiveCode: Application, RAD, general Yes Yes No Yes No Yes Weakly typed ...
Comparison of programming languages; General comparison; Assignment; Basic syntax; Basic instructions; Comments; Control flow Foreach loops; While loops; For loops
The loop counter is used to decide when the loop should terminate and for the program flow to continue to the next instruction after the loop. A common identifier naming convention is for the loop counter to use the variable names i , j , and k (and so on if needed), where i would be the most outer loop, j the next inner loop, etc.