How to picture "for" loop in block representation of algorithm


I have probem / strange question, i got algorithm with few "for" loops and now i need to do block scheme of this algorithm.

I know how to picture "while" loop, but is this acceptable to represent "for" loop using "while" and at this point make difference between souce code and algorithm?. Ofcourse assuming that all "for" loops are right in place and using loop of any other kind would produce unnecessary code which i avoided using "for" loops.

I'm guessing that this is rather impossible (at least I can't imagine this) to simply picture "for" loop, but maybe there is a way (if exists).

Thanks in advance

5/18/2009 7:01:48 PM

Accepted Answer

Here's a flow chart that illustrates a for loop:

Flow Chart For Loop

The equivalent C code would be

for(i = 2; i <= 6; i = i + 2) {
    printf("%d\t", i + 1);

I found this and several other examples on one of Tenouk's C Laboratory practice worksheets.

12/22/2013 3:26:55 PM

What's a "block scheme"?

If I were drawing it, I might draw a box with "for each x in y" written in it.

If you're drawing a flowchart, there's always a loop with a decision box.

Nassi-Schneiderman diagrams have a loop construct you could use.


The Algorithm for given flow chart :

enter image description here


Step :01

  • Start

Step :02 [Variable initialization]

  • Set counter: i<----K [Where K:Positive Number]

Step :03[Condition Check]

  • If condition True then Do your task, set i=i+N and go to Step :03 [Where N:Positive Number]
  • If condition False then go to Step :04


  • Stop