equality

While "we all know" that x == y can be problematic, where x and y are floating point values, this question is a bit more specific: int x = random.Next(SOME_UPPER_LIMIT); float r = x; // Is the following ALWAYS true? r == x Now, since the range of float of is much larger than that of integers (but the precision is insufficient to uniquely present integers at the edges), it would be nice if responses to this question also addressed which values of x the above can be guaranteed for, if it can be guaranteed at all. Currently my code is making this assumption (for relatively small values of x) - I

Say we have 5 string arrays as such: string[] a = {"The","Big", "Ant"}; string[] b = {"Big","Ant","Ran"}; string[] c = {"The","Big","Ant"}; string[] d = {"No","Ants","Here"}; string[] e = {"The", "Big", "Ant", "Ran", "Too", "Far"}; Is there a method to compare these strings to each other without looping through them in C# such that only a and c would yield the boolean true? In other words, all elements must be equal and the array must be the same size? Again, without using a loop if possible. You can use Linq: bool areEqual = a.SequenceEqual(b); Try using Enumerable.SequenceEqual : var equal =

Is there any equality predicate function in ImageMagick library? I want to compare two images and find whether they are the exactly same (all colors of the pixels are the same) or have any differences. I’ve looked around, but it seems not to have a such function. Should I write the function using pixel iterators by myself? ImageMagick provides the compare function to properly compare images. Checking the md5 checksum of two images is not the correct approach, since some image formats (e.g. PNG and JPEG with EXIF for example), contain the date and time the file was created (see example 1) below

I want to add objects of a custom type to a Set. I have several which are the same, i.e. they have the same values for their public variables. I don't want more than one instance of a "same" object to be added to the set, but each time a new object is created it is always added. This is because the equals method for class Object implements the most discriminating possible equivalence relation on objects: "For any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true)." Can I override the equals method for this

This is a follow up question for: Subtraction operation using only increment, loop, assign, zero We're only allowed to use the following operations: incr(x) - Once this function is called it will assign x + 1 to x assign(x, y) - This function will assign the value of y to x (x = y) zero(x) - This function will assign 0 to x (x = 0) loop X { } - operations written within brackets will be executed X times For example, addition can be implemented as follows: add(x, y) { loop x { y = incr(y) } return y } How do I implement the relational operators using these four operations? The relational