command-line-arguments

问题 I want to create a text file with mulitple lines using system calls in C and populate it with the text provided as command line arguments. This is what I wrote: #include <stdio.h> #include <fcntl.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #define MAX_SZ 1024 int main(int argc, char *argv[]) { if (argc != 3) { printf("Invalid Number of arguments\n"); printf("USAGE: ./a.out file_name \"msg\"\n"); } else { int fd_creat, fd_open, fd_write; char file_name[MAX_SZ]; char *msg =

问题 Id like to add comments like this: makecert -r ^ // This means SelfSigned -pe ^ // Private key is exportable -a sha512 ^ // The algoritm ... Is this possible? How? 回答1: Nothing official, but there is a simple and very effective hack - use undefined variables. At least one = is added to guarantee that the content cannot be a valid variable name, since the character cannot be used in a variable name. I use one at the beginning and end just for symmetry. Also, the comment cannot contain % or : .

问题 Id like to add comments like this: makecert -r ^ // This means SelfSigned -pe ^ // Private key is exportable -a sha512 ^ // The algoritm ... Is this possible? How? 回答1: Nothing official, but there is a simple and very effective hack - use undefined variables. At least one = is added to guarantee that the content cannot be a valid variable name, since the character cannot be used in a variable name. I use one at the beginning and end just for symmetry. Also, the comment cannot contain % or : .

问题 Id like to add comments like this: makecert -r ^ // This means SelfSigned -pe ^ // Private key is exportable -a sha512 ^ // The algoritm ... Is this possible? How? 回答1: Nothing official, but there is a simple and very effective hack - use undefined variables. At least one = is added to guarantee that the content cannot be a valid variable name, since the character cannot be used in a variable name. I use one at the beginning and end just for symmetry. Also, the comment cannot contain % or : .

问题 Whenever an existing android project is imported, in most cases we need to change values following with our installed tools version number in project/build.gradle buildscript { ... dependencies { classpath 'com.android.tools.build:gradle:x.x.x' } } in project/app/build.gradle android { compileSdkVersion xx buildToolsVersion "xx.x.x" defaultConfig { applicationId "com.example.app.xyz" minSdkVersion xx targetSdkVersion xx versionCode x versionName "x.x" } ... } dependencies { compile fileTree

问题 Whenever an existing android project is imported, in most cases we need to change values following with our installed tools version number in project/build.gradle buildscript { ... dependencies { classpath 'com.android.tools.build:gradle:x.x.x' } } in project/app/build.gradle android { compileSdkVersion xx buildToolsVersion "xx.x.x" defaultConfig { applicationId "com.example.app.xyz" minSdkVersion xx targetSdkVersion xx versionCode x versionName "x.x" } ... } dependencies { compile fileTree

问题 I am trying to statically compile a groovy script to speed up it's execution, but am not able to get it to work if command line arguments are used. My actual script is much longer, but the one-line script I use for this question perfectly reproduces my error. Using the following script ( test.groovy ) println(args.length) This can be compiled with the command groovyc test.groovy and ran by the java command java -cp .;%GROOVY_HOME%\lib\* test and will simply print the number of command line

问题 In Visual Studio Code, in the launch.json file that launches the app I'm writing, how do I add command line arguments? 回答1: As described in the documentation, you need to use the args attribute. E.g. { "type": "node", "request": "launch", "name": "Debug App", "program": "${workspaceFolder}/main.js", "args": ["arg1", "arg2", "arg3"] } 来源： https://stackoverflow.com/questions/57889703/in-visual-studio-code-how-to-pass-arguments-in-launch-json

问题 I can't pass strings starting with # as command-line arguments. Here is a simple test: #include <stdio.h> int main(int argc, char *argv[]) { for (int i = 1; i < argc; i++) printf("%s ", argv[i]); putchar('\n'); return 0; } If I input the arguments as follows: 2 4 # 5 6 The value of argc is 3 and not 6 . It reads # and stops there. I don't know why, and I can't find the answer in my copies of The C Programming Language and C Primer Plus . 回答1: # begins a comment in Unix shells, much like // in

问题 I know the program name is passed as the first argument, and next simple example will print it to the standard output : #include <iostream> int main ( int argc, char *argv[] ) { std::cout<<argv[0]<<std::endl; } Is there a function to get the program name? EDIT I am starting the program from the shell, and the above code will always print the program name (I am using fedora 9, but I am sure it works in other distros). I have found that /proc/self/ directory might contain what I am looking for,