for

for -- loop command

Syntax

For I := N_1 To N_2 Do C EndFor
For I := N_1 To N_2 Step D Do C EndFor

where I is the loop variable, N_1, N_2, and D are integer expressions,
and C is a sequence of commands.

Description

In the first form, the loop variable I is assigned the values N_1, N_1+1, ...,N_2 in succession. After each assignment, the command sequence C is executed. If N_2 < N_1, then the command sequence C is not executed.

The second form is almost the same, except that I is assigned the values N_1, N_1+D, N_1+2D, and so on, until the limit N_2 is passed. If N_2 - N_1 has opposite sign to D, then the command sequence C is not executed.

Example

/**/  for N := 1 to 5 do print 2^N, " "; endfor;
2 4 8 16 32

/**/  for n := 1 to 20 step 3 do print n, " "; endfor;
1 4 7 10 13 16 19

/**/  for N := 10 to 1 step -2 do print N, " "; endfor;
10 8 6 4 2

/**/  for N := 5 to 3 do print N, " "; endfor;  -- no output

Loops can be nested.

Example

/**/   define MySort(ref L)
/**/     for i := 1 to len(L)-1 do
/**/       MaxPos := i;
/**/       for j := i+1 to len(L) do
/**/         if L[j] < L[MaxPos] then MaxPos := j; endif;
/**/       endfor;
/**/       if MaxPos <> i then
/**/         swap(ref L[i], ref L[MaxPos]);
/**/       endif;
/**/     endfor;
/**/   enddefine;

/**/  M := [5,3,1,4,2];
/**/  MySort(ref M);
/**/  M;
[1, 2, 3, 4, 5]

NOTE: we used ref L so that the function can change the value of the variable referenced by L. See ref .

See Also