variables

问题 This question already has answers here : What are those pipe symbols for in Ruby? (7 answers) Closed 8 days ago . What is the | | around profile below called, what does it mean, and why it is after do ? I thought do is followed by a loop block or so. ticks = get_all[0...MAX].map do |profile| # ... end 回答1: it's like a foreach, so profile will be a different value in each of the functions calls, one function call per element in get_all. see this: my_array = [:uno, :dos, :tres] my_array.each do

问题 This question already has answers here : Null check chain vs catching NullPointerException (19 answers) Check if last getter in method chain is not null (3 answers) Closed 3 years ago . I have an object and i want to check if this object or nested fields are null. I want to print this neted field, but i should check if there is null in some level, otherwise i will get null pointer exception . I know i can do this: if( object != null && object.A != null && object.A.B != null && object.A.B.C !=

问题 This question already has answers here : Null check chain vs catching NullPointerException (19 answers) Check if last getter in method chain is not null (3 answers) Closed 3 years ago . I have an object and i want to check if this object or nested fields are null. I want to print this neted field, but i should check if there is null in some level, otherwise i will get null pointer exception . I know i can do this: if( object != null && object.A != null && object.A.B != null && object.A.B.C !=

问题 This question already has answers here : Null check chain vs catching NullPointerException (19 answers) Check if last getter in method chain is not null (3 answers) Closed 3 years ago . I have an object and i want to check if this object or nested fields are null. I want to print this neted field, but i should check if there is null in some level, otherwise i will get null pointer exception . I know i can do this: if( object != null && object.A != null && object.A.B != null && object.A.B.C !=

问题 This question already has answers here : Null check chain vs catching NullPointerException (19 answers) Check if last getter in method chain is not null (3 answers) Closed 3 years ago . I have an object and i want to check if this object or nested fields are null. I want to print this neted field, but i should check if there is null in some level, otherwise i will get null pointer exception . I know i can do this: if( object != null && object.A != null && object.A.B != null && object.A.B.C !=

问题 Is it possible to use something like variable(nameOfVariable) = myValue What I'm doing : On of my XLA Add-In macro uses a lot of module-level variables ; many being Public and 256 being Const . Part of the Public ones are some pseudo-Const being udpated once in a while from the content of a (network-accessible) config.init file. I thus need to assign value to a bunch of Public variables , at the start of the macro or when the user launches some specific procedures. The content of the config

问题 Is it possible to use something like variable(nameOfVariable) = myValue What I'm doing : On of my XLA Add-In macro uses a lot of module-level variables ; many being Public and 256 being Const . Part of the Public ones are some pseudo-Const being udpated once in a while from the content of a (network-accessible) config.init file. I thus need to assign value to a bunch of Public variables , at the start of the macro or when the user launches some specific procedures. The content of the config

问题 Is it possible to use something like variable(nameOfVariable) = myValue What I'm doing : On of my XLA Add-In macro uses a lot of module-level variables ; many being Public and 256 being Const . Part of the Public ones are some pseudo-Const being udpated once in a while from the content of a (network-accessible) config.init file. I thus need to assign value to a bunch of Public variables , at the start of the macro or when the user launches some specific procedures. The content of the config

问题 I need to know a way for use environment variables in the C programming language. How can I use and read them? For example, read an environment variable or take the value of an environment variable and load it in another variable. 回答1: You can use following functions - char * getenv (const char *name) -returns a string that is the value of the environment variable name. char * secure_getenv (const char *name) Read about some more functions here -http://www.gnu.org/software/libc/manual/html

问题 I need to know a way for use environment variables in the C programming language. How can I use and read them? For example, read an environment variable or take the value of an environment variable and load it in another variable. 回答1: You can use following functions - char * getenv (const char *name) -returns a string that is the value of the environment variable name. char * secure_getenv (const char *name) Read about some more functions here -http://www.gnu.org/software/libc/manual/html