symbols

问题 I need to find a way to convert any string to a symbol. If there was a function that did that, it would be something like this: function toSymbol(variable) = { //... converts var to symbol }; //toSymbol("mySymbolString") would return: mySymbolString Is there any clever way of doing this other than storing potential string to symbol mappings in a dictionary? 回答1: function toSymbol(variable) { return Symbol(variable); }; Keep in mind toSymbol("some_string") === toSymbol("some_string") // false

问题 I am trying to create a sort of pay slip to print in the console but I receive the following errors from my code. Its really just one error many times, but I don't think I have enough knowledge of java to fix it on my own. import java.io.*; import java.text.*; import java.util.Scanner; class Assign2num2 { public static void main (String [] args) { String famname, firstname; double gross, deduct, tax, pay, hrs, ovtm; char letter, yn; Scanner in = new Scanner(System.in); System.out.println(

问题 I have to include math symbols in my asp.net so whatever the symbols it may be sigma , integral , pie etc..or any how to write or display the Symbols in asp.net it should be UI so when the user click the particular Symbols it will display in the textbox or any editor control.. If anyone have idea let me know...? thanks. 回答1: Since you are using ASP.NET you can use the HTML character entity references to display symbols. http://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity

问题 UPDATE : Recently a brilliant article from Mozilla came up. Read it if you're curious. As you may know they are planning to include new Symbol primitive type in ECMAScript 6 (not to mention some other crazy stuff). I always thought that the :symbol notion in Ruby is needless; we could easily use plain strings instead, like we do in JavaScript. And now they decide to complicate things in JS with that. I don't understand the motivation. Could someone explain to me whether we really need symbols

问题 I am trying to mess around with my assembly function to get it to work but have ran into a couple of errors that are difficult to get by. One is A2005 which states symbol redefinition :_Average. The other one is A1010 which states unmatched block nesting :_Average Any help is appreciated. .cpp code #include<iostream> using namespace std; extern "C" long Average(long, long[]); int main() { long Array1[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; long Array2[11] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,

问题 I am writing a c++ prgram and have to read some data from a .txt file.the format looks like the following: " name gender DD/MM/YYYY HH:MM:SS " I know how to read a .txt file and cin the words one by one, but i dont know how to deal with the symbols " / " or " : ". I have to compare the ages of two person. Please help! 回答1: Aside from the easiest way with sscanf , like Jerry describes, it's also possible with iostreams. Just read the data you want from the file, until you hit a seperator, and

问题 I was trying to understand the System.map file that gets created every time one compiles the Linux kernel, I was trying to understand the values presented in the System.map file. Following is a sample information from it 000001d5 A kexec_control_code_size 00400000 A phys_startup_32 c0400000 T _text c0400000 T startup_32 c04000b4 T start_cpu0 c04000c4 T startup_32_smp c04000e0 t default_entry c0400158 t enable_paging c04001da t is486` If you see the first line, the type of the symbol kexec

问题 I'm working on a code formatter for Lisp, which is using the reader to read code into S-expression format. This works fine for plain symbols. It doesn't work so well for qualified symbols. foo:bar is only readable if the package foo has been defined, but of course as far as the formatter is concerned, it has not, because unlike the compiler, the formatter is only reading the code, not executing it. How can I tell the reader to either go ahead and automatically create a package foo on the fly,

问题 I'm building what is basically a mathematic text editor in an HTML file. My goal is to allow the user to display numbers and MathML symbols in a textarea, but completely without the use of a physical keyboard. On the bottom of the page I have a mock keyboard made of buttons with numbers and arithmetic symbols. When the user clicks these buttons, the corresponding number or symbol will then appear inside the textarea. So far, I can get this to work with numbers, but not the MathML symbols. Is

问题 Whenever I am using lcov command (lcov-1.9) for gcc 3.4 compiled objects and the corresponding .gcda files, I get an error. Command I execute: lcov -c -d . --gcov-tool /usr/bin/gcov34 -o datafile Error: /usr/bin/perl: symbol lookup error: /u01/R122_EBS/fs1/FMW_Home/webtier/perl/lib/5.10.0/x86_64-linux-thread-multi/auto/Cwd/Cwd.so: undefined symbol: Perl_Istack_sp_ptr Is it because something is wrong with Perl? (But, Perl on our development server should be probably be alright.) Or because of