Question

I am making a calculator on C#.
I have to use float because, when I divide numbers, I get an answer less than 0.
but, I want the calculator to begin the new calculation with the answer i already got, So i wrote:

 a = Convert.ToInt64(answer);

but, it doesn’t help, it converts the answer to int64 too.
I think, I will be able to do with pointers, but I don’t know how.

So how can I copy the value of answer to ‘a’ (the Input), without converting answer?

    Int64 a; //1st Input
    Int64 b; //2nd Input
    float answer;
    char d;
    bool pressed;
   private void button11_Click(object sender, EventArgs e)
    {
        if (d == '+') answer = a + b;
        if (d == '-') answer = a - b;
        if (d == '*') answer = a * b;
        if (d == '/') answer = a / b;
        textBox1.Text = a.ToString() + d + b.ToString() + '=' +answer.ToString();
        a = Convert.ToInt64(answer);
        b = 0;
    }

sorry, for the lack of the whole source code, if anybody want’s me to add them too just tell me 🙂

Answer 1

Couple of observations that may help:

1. Your inputs probably shouldn’t be Int64 in the first place, as it is unlikely the user will work only in whole numbers, especially once they start using division.
2. Your answer and your inputs should be the same type, this will remove your casting issues.
3. Float is imprecise and may not be the best option. If you need better accuracy than Float can allow, you may try Decimal. (if you are unaware of the limitations of floating point arithmetic, Google for it)