NumberFormat - low level function

[Charles Pegge]

This affects the behaviour of the internal float_to_ascii function, which is used by str() etc.

It has 6 parameters but innvoking it without params restore the default behaviour.

Code: OxygenBasic

1. 'numberformat
2. 'action:   control how numbers are converted to strings
3. 'use:      change the format of numbers
4. 'example:  numberformat 3,0,0,0 : print 3.14159
5. '          'result: 3.142
6. 'remarks:  there are 6 parameters:
7. '          1 decimal places (0..16)
8. '          2 strip end zeros (0 or 1)
9. '          3 always use scientic notation E format (0 or 1)
10. '          4 suppress 0 before decimal point: 0.1 becomes .1 (0 or 1)
11. '          5 insert extra leading space for non-negative numbers (0 or 1)
12. '          6 width allocated before decimal point: (0..31)
13. '            (inserting lead padding spaces)
14. '
15. '          when no parameters are given, it reverts to the default settings:
16. '          16,1,0,0,0,0
17. '          rounding is automatically performed before the decimal places are truncated.
18.  
19. cr=chr(13)+chr(10)
20.  
21. pr="Number Format Control Examples" cr
22.  
23. NumberFormat  'default
24.  
25. pr+=cr ">>" str 1234.5678
26.  
27. NumberFormat 16,1,1,0,0,0  'always use scientific notation
28.  
29. pr+=cr ">>" str -1234.5678
30.  
31. NumberFormat 08,0,0,0,0,0  '8 decimal places, leave end zeros
32.  
33. pr+=cr ">>" str -1234.5678
34.  
35. NumberFormat 16,1,0,0,1,0  'insert extra leading space for non-negative numbers
36.  
37. pr+=cr ">>" str 1234.5678
38.  
39. NumberFormat 2,1,0,0,1,10  'pad numbers 11 places before decimal point including '-' place
40.  
41. pr+=cr ">>" str -1234.5678
42. pr+=cr ">>" str 1234.5678
43.  
44.  
45. print pr
46.  
47. numberformat 'restore default seeting 16,1,0,0,0,0
48.  
49.  

[Aurel]

Hi Charles..
In my exprEval i receive to long (for my taste) decimal numbers..
like:
16.666667938232422
instead of something like:
16.666667
i just see this topic,so would be good to have something like SETDECIMALS n,right?
or not??
i know that i can cut signs from decimal point and then save this new string ...
so what you think?

Aurel

[kryton9]

Aurel, what you want you would do this according to the code I see:

Now getting: 16.666667938232422 
You    want: 16.666667

Use:
NumberFormat 6, 1

[Charles Pegge]

str can be used with a second parameter, specifying decimal places:

single a=2/3
print a
print str(a,5)