How do I subtract from string?

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- mostafanastary
- - Joined 8 Jan, 2015
  - 56 topics • 191 posts
- 1
- 20 Jan, 2015
- Quote
Hi,

i create a program like calculator with C2 but i need to subtract the last number to first if Del button clicked.

in my source i use system every tick to show the textbox value...

please help me,

best regards.
- 7Soul
- - Joined 15 Dec, 2010
  - 103 topics • 1,056 posts
- 1
- 20 Jan, 2015
- Quote
left(string, len(string) - 1)

left() takes the first X characters of your string

len() counts the length of the string

So left(string, len(string) - 1) takes all characters from the first to 1 before the last
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- mostafanastary
- - Joined 8 Jan, 2015
  - 56 topics • 191 posts
- 1
- 20 Jan, 2015
- Quote
Thank you for reply, but i'm new in C2, How ca i use that?

my global variable is : callnumber and it is the textbox value

can i use the : "left(callnumber , len(callnumber ) - 1) " in textbox set text?
- mostafanastary
- - Joined 8 Jan, 2015
  - 56 topics • 191 posts
- 1
- 20 Jan, 2015
- Quote
OK, I use like that write here and it work, thank you