integer

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . I get this error when I try to use Integer.parseInt() with a single char. String s = "s"; System.out.println((char) Integer.parseInt(s)); Is what gives me the error is this: Exception in thread "main" java.lang.NumberFormatException: For input string: "S" 回答1: The letter S is not a number. Did you mean to write

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . I get this error when I try to use Integer.parseInt() with a single char. String s = "s"; System.out.println((char) Integer.parseInt(s)); Is what gives me the error is this: Exception in thread "main" java.lang.NumberFormatException: For input string: "S" 回答1: The letter S is not a number. Did you mean to write

问题 The stdint.h header lacks an int_fastest_t and uint_fastest_t to correspond with the {,u}int_fastX_t types. For instances where the width of the integer type does not matter, how does one pick the integer type that allows processing the greatest quantity of bits with the least penalty to performance? For example, if one was searching for the first set bit in a buffer using a naive approach, a loop such as this might be considered: // return the bit offset of the first 1 bit size_t find_first

问题 I am having trouble with my project because I can't get the beginning correct, which is to read a line of integers separated by a space from the user and place the values into an array. System.out.println("Enter the elements separated by spaces: "); String input = sc.next(); StringTokenizer strToken = new StringTokenizer(input); int count = strToken.countTokens(); //Reads in the numbers to the array System.out.println("Count: " + count); int[] arr = new int[count]; for(int x = 0;x < count;x++

问题 I have a 2D matrix myMatrix of integers which I want to save its content to a text file. I did the following: save myFile.txt myMatrix -ASCII I get this message: Warning: Attempt to write an unsupported data type to an ASCII file. Variable 'myMatrix' not written to file. and nothing is written. What to do? 回答1: To write myMatrix to myFile.txt: dlmwrite('myFile.txt', myMatrix); To read the file into a new matrix: newMatrix = dlmread('myFile.txt'); 回答2: You have to convert your matrix to double

问题 Assume 32 Bit OS. One memory location in a computer stores how much data? Whats the basic unit of memory storage in a computer? For Example to a store a integer what will be the memory addresses required? If basic unit is BYTE the integer requires 4 bytes. So if I need to store a byte then if start putting in the 1st byte in memory location 0001 then will my integer end at 0003 memory location? Please correct me if am wrong? 回答1: Most commonly, modern systems are what you call "byte

问题 In a loop in C++, I usually encounter situations to use ++ or +=1 , but I can't tell their difference. For instance, if I have an integer int num = 0; and then in a loop I do: num ++; or num += 1; they both increase the value of num , but what is their difference? I doubt num++ could work faster than num+=1 , but how? Is this difference subtle enough to be ignored? 回答1: num += 1 is rather equivalent to ++num . All those expressions ( num += 1 , num++ and ++num ) increment the value of num by

问题 In a loop in C++, I usually encounter situations to use ++ or +=1 , but I can't tell their difference. For instance, if I have an integer int num = 0; and then in a loop I do: num ++; or num += 1; they both increase the value of num , but what is their difference? I doubt num++ could work faster than num+=1 , but how? Is this difference subtle enough to be ignored? 回答1: num += 1 is rather equivalent to ++num . All those expressions ( num += 1 , num++ and ++num ) increment the value of num by

问题 I use Scilab, and want to convert an array of booleans into an array of integers: >>> x = np.array([4, 3, 2, 1]) >>> y = 2 >= x >>> y array([False, False, True, True], dtype=bool) In Scilab I can use: >>> bool2s(y) 0. 0. 1. 1. or even just multiply it by 1: >>> 1*y 0. 0. 1. 1. Is there a simple command for this in Python, or would I have to use a loop? 回答1: Numpy arrays have an astype method. Just do y.astype(int) . Note that it might not even be necessary to do this, depending on what you're

问题 In my android app I have created a preference class(which extends PreferenceActivity) for storing about 10 integer values. I am not creating any xml file for that activity in R.xml as I don't want it. I just need to store 10 integer variables in this file(which can save it even after exit) and I want to get these values from another activity, perform some changes to the preferences, then save the preference class. My queries are: How can I store an integer variable in preference class? How to