Sorry but i try to find an english forum where i can explain my problem so please don't be mean and do u know a forum where i could explain it ?
Please don't take Matri X's reply as hostile, I'm sure s/he means well.
The thing that you need to understand is that the people of this forum want to help people (why else would they be here?). They just need you to explain what your problem is.
From what I gather, you are trying to make a calculator, am I correct? Are you writing it in C++? Can you explain what this calculator is supposed to do (is it something simple like a+b=c or are you using more "complex" features like trig functions or the likes)? What are you having problems with? You say you can't "do an algorithm", what algorithm are you trying to do/ implement, and why can't you do/ find it? If you can answer those questions, I'm sure that someone will be more than glad to help you :)