[code] Dim i As Single For i = 0 To 3 Step 0.1 Debug.Print i Next i[/code]And the result: 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8000001 0,9000001 1 1,1 1,2 1,3 1,4 1,5 1,6 1,7 1,8 1,9 2 2,1 2,2 2,3 2,4 2,5 2,6 2,7 2,799999 2,899999 2,999999 Normal or not?">
 Normal or not? Walrus The code:[code] Dim i As Single For i = 0 To 3 Step 0.1 Debug.Print i Next i [/code] And the result: 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8000001 0,9000001 1 1,1 1,2 1,3 1,4 1,5 1,6 1,7 1,8 1,9 2 2,1 2,2 2,3 2,4 2,5 2,6 2,7 2,799999 2,899999 2,999999 Normal or not? Eric Coleman yes, that's normal. Data in computers is stored in a binary format. Consider the integer conversion from binary to decimal. Each digit is a multiplier for the base. Example, the number 804 in decimal. What each digit means is that each number is a multiple for a certain value. The values in decimal, from right to left are 1, 10, 100, 1000, 10000. Or in power notation it's 10^0, 10^1, 10^2, 10^3, 10^4, etc. The numer 804 is the equation (4 * 10^0) + (0 * 10^1) + (8 * 10^2) + (0 * 10^3) + (0 * 10^4) .... The value of 0 for unwritten digits is implied. Now consider binary, but instead of base 10 it is base 2. Each digit from right to left is a power of 2 instead a power of 10. 1, 2, 4, 8, 16, etc. The number 1011 is the sum of (1 * 2^0) + (1 * 2^1) + (0 * 2^2) + (1 * 2^3) + (0 & 2^4) + .... If that makes any sense to you, then consider fractions. 1/10 in power notation is 10^-1. 1/100 is 10^-2. The value of PI would be 3,141..., in in decimal notation it would be (3 * 10^0) + (1 * 10^-1) + (4 * 10^-2) + (1 * 10^-3) .... Positive powers, 10^(1,2,3 etc) are multiples of 10. Negative powers or divisions of 10. For binary numbers a fraction has to be represented as sum of the units of 1/2, 1/4, 1/16, 1/32, 1/64, 1/128. Or in power notation it would be 2^-1, 2^-2, 2^-3, 2^-4, etc. The conversion from binary fractions to decimal fractions isn't easy and it is not always possible to have an accurate representation with the limited precision of a computer. Hopefully you understand what numbers represent. However, the SINGLE and DOUBLE data types aren't exactly as I described. They're a little bit more complicated because they allow an arbitrary size within a limited precision. If you understand the stuff I described above, then grapsing floating point notation should be easy for you. Walrus I understand. I thought it had sth to do with binary format, but I've never thought about how fractions are stored. Btw, I wrote a C++ equivalent, and this time the result was like you'd expect it to be. So how does C++ deal with this? Thank you very much for your time! Sion Wow, I only thought that happend in C/C++. Stupid machines not able to store unlimited numbers for decimals! Bah! [;)]