modulus
How to test whether a float is a whole number in Go?
Assuming that your numbers will fit into an int64, you can compare the float value with a converted integer value to see if they’re the same: if a == float64(int64(a)) { … } Alternatively, if you need the entire float64 domain, you can use the math.Trunc function, with something like: if a == math.Trunc(a) { … Read more
Faster modulus in C/C#?
If the denominator is known at compile time to be a power of 2, like your example of 2048, you could subtract 1 and do a bitwise-and. That is: n % m == n & (m – 1) …where m is a power of 2. For example: 22 % 8 == 6 Dec Bin —– … Read more
What is the modulus operator (%) in swift 3?
You can simply follow the diagnostic message: let randomIndex = Int(drand48().truncatingRemainder(dividingBy: Double(alphabetColors.count))) Or using arc4random_uniform(_:) would be a better alternative. let randomIndex = Int(arc4random_uniform(UInt32(alphabetColors.count)))
How does the modulus operator work?
in C++ expression a % b returns remainder of division of a by b (if they are positive. For negative numbers sign of result is implementation defined). For example: 5 % 2 = 1 13 % 5 = 3 With this knowledge we can try to understand your code. Condition count % 6 == 5 … Read more
Why does modulus operator return fractional number in javascript?
Because JavaScript uses floating point math which can lead to rounding errors. If you need an exact result with two decimal places, multiply your numbers with 100 before the operation and then divide again afterwards: var result = ( 4990 % 10 ) / 100; Round if necessary.
Reverse Modulus Operator
I was revisiting this question and realized it is possible based off of the answer @Gorcha gave. (a + x) mod m = b a + x = nm + b x = nm + b – a for some integer n I don’t know why I didn’t realize it before but the solution can … Read more
C# modulus operator
I wasn’t quite sure what to expect, but I couldn’t figure out how the remainder was 3. So you have 3 cookies, and you want to divide them equally between 4 people. Because there are more people than cookies, nobody gets a cookie (quotient = 0) and you’ve got a remainder of 3 cookies for … Read more
Fast way to calculate n! mod m where m is prime?
n can be arbitrarily large Well, n can’t be arbitrarily large – if n >= m, then n! ≡ 0 (mod m) (because m is one of the factors, by the definition of factorial). Assuming n << m and you need an exact value, your algorithm can’t get any faster, to my knowledge. However, if … Read more
Selecting rows where remainder (modulo) is 1 after division by 2?
MySQL, SQL Server, PostgreSQL, SQLite support using the percent sign as the modulus: WHERE column % 2 = 1 For Oracle, you have to use the MOD function: WHERE MOD(column, 2) = 1