compilation

问题 I have installed java in my CentOS release 5.5 machine using the command yum install java . But I am unable to compile a class using javac. Do I need to install any other package? I have tried to locate the javac executable but i am unable to locate it. /usr/bin/java is linked as follows: /usr/bin/java -> /etc/alternatives/java /etc/alternatives/java -> /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java I have seen the following output by yum list installed |grep java : java-1.6.0-openjdk.x86_64

问题 I am trying to learn bashing. I am trying to run ./test testcase the file in test case has the arguments 9 11 22 13, 32 35 32 16 on the next line and so on My program takes 4 arguments. Right now if testcase has one line of arguments i.e 3 5 6 7 it works fine, but when there is more than 2 it can't run the program properly. I know I need a while loop to read each line of the file, but I am stuck here. If someone could help me it would be greatly appreciated. Thank you in advance. I've asked

问题 I'm trying to compile a C++ code (OpenCV) and I'm going to the end. I just have a few "No such file or directory" compile error into XCode 4 on those lines : #include <map> #include <string> #include <iostream> What may I include to make it find the "files" ? I don't see. I use another project based on OpenCV with Objective-C inside for example that pass the compile process with success , files are the same, and I checked all the Build settings lines one after the other, and it's all the same

问题 I am using xcode to compile my opencv project, and I have some settings as below: HEADER_SEARCH_PATHS = /usr/local/include LIBRARY_SEARCH_PATHS = /usr/local/lib OTHER_LDFLAGS = -lopencv_calib3d -lopencv_core -lopencv_features2d -lopencv_flann -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_ml -lopencv_objdetect -lopencv_photo -lopencv_shape -lopencv_stitching -lopencv_superres -lopencv_ts -lopencv_video -lopencv_videoio -lopencv_videostab I want to know what shall I write by

问题 I am using a library that consists almost entirely of templated classes and functions in header files , like this: // foo.h template<class T> class Foo { Foo(){} void computeXYZ() { /* heavy code */ } }; template<class T> void processFoo(const Foo<T>& foo) { /* more heavy code */ } Now this is bad because compile times are unbearable whenever I include one of those header files (and actually I include many of them in each of my compilation units). Since as a template parameter I only use one

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago . What are the main steps behind compiling a C program? By compiling, I mean (maybe wrongly) getting a binary from a plain text containing C code, using gcc. I would love to understand some key points of the process: By the end of the day I need to transform my C code to a language

问题 Is it possible for a program written in Java to compile a file using the JDK compiler (aside from using Java to open command prompt and throw the "javac" command at it to compile the file)? 回答1: In Java 6 and onwards there is an API to use the compiler. This might be what you are looking for. http://www.javabeat.net/2007/04/the-java-6-0-compiler-api/ http://docs.oracle.com/javase/6/docs/api/javax/tools/JavaCompiler.html Note that you need a JDK to have the compiler available. JRE will not be

问题 Traditionally, the accepted characters we can use as part of an identifier in C++ are _, a-z, A-Z and 0-9 after the first character. Is there a way to configure Visual Studio or GCC to accept emoji as part of the identifier names (or any other arbitrary unicode character)? int a = 2, 😊 = 3; 😊++; 😊 *= 2; int ∑(int a, int b) {return a + b;} cout << ∑(a * 😊, 3) << endl; const double π = 3.14159; double α = sin(π / 2.0); 回答1: We can see from Unicode/special characters in variable names in clang

问题 When I write int main() { int j; } The memory for j is allocated at the time of compilation, but when during compilation? What are the various stages of compilation when memory is allotted to a variable? What if j were global? 回答1: I guess you are mixing things up. Compiler doesn't allocate memory for variables - it generates code that allocates memory for variables at runtime. For globals is will be added to program start-up code. 回答2: In C, main is compiled the same as every other function:

问题 I have found an example code for a Scala runtime scripting in answer to Generating a class from string and instantiating it in Scala 2.10, however the code seems to be obsolete for 2.11 - I cannot find any function corresponding to build.setTypeSignature . Even if it worked, the code seems hard to read and follow to me. How can Scala scripts be compiled and executed in Scala 2.11? Let us assume I want following: define several variables (names and values) compile script (optional improvement)