negative-number

问题 Ok so I'm working on a program that takes in an image, isolates a block of pixels into an array, and then gets each individual rgb value for each pixel in that array. When I do this //first pic of image //just a test int pix = myImage.getRGB(0,0) System.out.println(pix); It spits out -16106634 I need to get the (R, G, B) value out of this int value Is there a formula, alg, method? 回答1: The BufferedImage.getRGB(int x, int y) method always returns a pixel in the TYPE_INT_ARGB color model. So

问题 In java when you do a % b If a is negative, it will return a negative result, instead of wrapping around to b like it should. What's the best way to fix this? Only way I can think is a < 0 ? b + a : a % b 回答1: It behaves as it should a % b = a - a / b * b; i.e. it's the remainder. You can do (a % b + b) % b This expression works as the result of (a % b) is necessarily lower than b , no matter if a is positive or negative. Adding b takes care of the negative values of a , since (a % b) is a

问题 I am now doing reading input data from txt file and write the results into txt file. However the results runs in the simulation works well but it fail to link back the the conv module which is o = a+b; the system able to read the values in x.txt and d.txt but cannot link it back to a and b. What is my mistake and how to correct it? And from the same cases in i found out that the system cannot write out negative decimal value although it is change to "%d\n" in $fwrite. Any method to solve that

问题 In this program, I am attempting to read a name and their GPA from a file. The first name is Audrey, then a white space, and then 3.6. The second line is Oakley, then a white space, and 3.5. int main() { FILE * fPtr; FILE * fPtr2; char x[10] = { "Oakley " }; double y; int z; fPtr = fopen("data.txt", "r"); if (fPtr == NULL) // open failure puts("File open for read failed"); else { while (scanf("%d", &z) != EOF) { fscanf(fPtr, "%s", x); fscanf(fPtr, "%lf", &y); fprintf(stdout, "Value read = %s

问题 I need to convert hexadecimal 4-digits values to decimal so I used ssscanf but it is not work on negative numbers... For example, int test; sscanf("0xfff6","%x",&test); return 65526 instead of -10. How can I resolve that ? 回答1: You have to do it manually. x conversion specifier performs a conversion from an unsigned int and it requires an argument of type pointer to unsigned int . For example with a cast: unsigned int test; int result; sscanf("0xfff6","%x", &test); result = (int16_t) test;

问题 How to assign a negative number (-123 or -123.00) to a ModelDriven bean (implements ModelDriven< Bean >). When i try passing the value through request for that action it throws below exception Fri Aug 10 18:45:27 IST 2012 unable to convert value using type converter [com.opensymphony.xwork2.conversion.impl.XWorkBasicConverter] Overflow or underflow casting: "-123.12" into class java.lang.Double - [unknown location] at com.opensymphony.xwork2.conversion.impl.XWorkBasicConverter

问题 This is a continuation from a previous question: Rfast hd.eigen() returns NAs but base eigen() does not I have been having a problem with .Internal(La_rs((x)) returning different results on different machines. I suspect it may have something to do with number formatting, because on the same machine, if I save as a CSV and re-open, I don't get negatives anymore: On Clear Linux install: > load("input_to_La_rs.Rdata") > r <- .Internal(La_rs(as.matrix(x), only.values = FALSE)) > sum(r$values < 0)

问题 I'm trying to convert a function in java to pl/pgsql, and one problem that I found is when I'm trying to sum 2 negative numbers, and a get a positive number, more specifically : public void sum(){ int n1 = -1808642602; int n2 = -904321301; System.out.println(n1 + n2);// result is 1582003393 } And in pl/pgsql I get an integer out of range error, and if I change the variables type to bigint i get a normal sum of 2 negative numbers, that is -2712963903, instead of 1582003393 How do I do to pl

问题 I'm trying to convert an base 10 number to a base 2 and back to base 10. It works only for positive argument_decimal argument_binary = Integer.toBinaryString(argument_decimal); back_converted_argument_decimal = Integer.valueOf(argument_binary, 2); For argument_decimal beeing negative, I get "java.lang.NumberFormatException: For input string: "11111111111111111111111111111111"" EDIT: here is what I do: latitude_binary = Integer.toBinaryString((int)(latitude_decimal * 1000000)); back_converted

问题 Alright, I'm doing this for a project and whenever I attempt to have it divide by zero or square root a negative number that program closes out. I've attempted to find something I can insert into the code to make it display a message and then prompt for the value again, but everything that I've tried inserting causes the program to close out instantly when I start it up. Here's the calculator without anything inserted to fix the crashes. import math def convertString(str): try: returnValue =