add costant to the same cell

[esa3047@exce]

hello.!!!
want to know how is possible to excel equality
A1 = A1 + k, where A1 is the same cell and k is a constant. As achievement?

[Pepe Le Mokko]

Could you be a bit more explicit please?

[esa3047@exce]

hello !, Pepe, Thanks for your attention.

Well, in other programming languages ​​(basic, clarion, etc), a variable equal
it may itself be changed in any moment. Say, if A = 5 and I now that A is worth 15, I only equality
A = A + 10. I have trouble doing in Excel, hence my question. Not familiar with the English