How do I subtract from string?

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.

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

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?

OK, I use like that write here and it work, thank you