braces

问题 I found several topics about pyparsing. They are dealing with almost the same problem in parsing nested loop, but even with that, i can't find a solution to my errors. I have the following format : key value; header_name "optional_metadata" { key value; sub_header_name { key value; }; }; key value; Key is alphanum Value may be type of Int, String, with alphanum + "@._" key/value may be after a brace block key/value may be in the file before the first brace block key/value before or after a

问题 Braces in a string are considered to be balanced if they met the following conditions, All braces must be closed. braces come in a pair of the form of (), {}, [] . The left brace opens the pair and the right one closes it. In any set of nested braces, the braces between any pair must be closed. For example, [{}] is a valid grouping of braces but [}]{} is not. I tried with the below code snippet but not getting the expected result, let firstBracketOpening = "(" let firstBracketClosing = ")"

问题 Braces in a string are considered to be balanced if they met the following conditions, All braces must be closed. braces come in a pair of the form of (), {}, [] . The left brace opens the pair and the right one closes it. In any set of nested braces, the braces between any pair must be closed. For example, [{}] is a valid grouping of braces but [}]{} is not. I tried with the below code snippet but not getting the expected result, let firstBracketOpening = "(" let firstBracketClosing = ")"

问题 IE, this: if (x > 5) return test; Would always become: if (x > 5) { return test; } I'm not talking about the brace style (Allman, GNU, Whiteman, etc) I just mean having the braces there at all. There is something to prevent/enable single-line control statements like: if (x > 5) return test; which is AllowShortBlocksOnASingleLine , but that's not what I'm looking for here. If it works on clang 7 that's ideal, but if not let me know. 回答1: It's understandable you would want to stick with clang

问题 IE, this: if (x > 5) return test; Would always become: if (x > 5) { return test; } I'm not talking about the brace style (Allman, GNU, Whiteman, etc) I just mean having the braces there at all. There is something to prevent/enable single-line control statements like: if (x > 5) return test; which is AllowShortBlocksOnASingleLine , but that's not what I'm looking for here. If it works on clang 7 that's ideal, but if not let me know. 回答1: It's understandable you would want to stick with clang

问题 What is the formal difference between passing arguments to functions in parentheses () and in braces {} ? The feeling I got from the Programming in Scala book is that Scala's pretty flexible and I should use the one I like best, but I find that some cases compile while others don't. For instance (just meant as an example; I would appreciate any response that discusses the general case, not this particular example only): val tupleList = List[(String, String)]() val filtered = tupleList

问题 I'm confused on need for braces after IF() expression. When using IF(){...}ELSE{...} I'm used to using braces around both IF and ELSE blocks. But when I use no ELSE block it works with no braces and fails with braces: works: IF()... fails: IF(){...} Example below, this is for a microcontroller #include "simpletools.h" int main() { while(1) { print("button = %d\n", input(3)); if(input(3) == 1) //works if no braces high(14); pause(50); low(14); pause(50); } //while } // main 回答1: A single

问题 In the following example,I've illustrated this using two structures test1 and test2 .The first has two elements-an integer array sized two,and a float element.The second structure has 3 elements,2 integers and one float. I initialize two structure variables s1 and s2 for test1 as: s1={{23,52},2.5},s2={21,19,3.6}; Both work fine even though for s2 I have taken out the braces that enclose the array elements.It works fine without warning and output is correct.But when I initialize 2 variables

问题 set B {pc_0::!mx_0 pi::$mx_0} puts $B set A "" foreach x $B { lappend A $x } puts $A The output of this program is pc_0::!mx_0 pi::$mx_0 pc_0::!mx_0 {pi::$mx_0} It is strange that tcl adds curly braces in second output. I guess it is because it uses $ symbol. But I really need to use it and I don't want the braces to be inserted. How this can be explained and how to avoid the braces? 回答1: As a general rule, don't treat lists as strings . Pretend that they don't have a string representation.

问题 I know the difference in purpose between parentheses () and curly braces {} when grouping commands in bash. But why does the curly brace construct require a semicolon after the last command, whereas for the parentheses construct, the semicolon is optional? $ while false; do ( echo "Hello"; echo "Goodbye"; ); done $ while false; do ( echo "Hello"; echo "Goodbye" ); done $ while false; do { echo "Hello"; echo "Goodbye"; }; done $ while false; do { echo "Hello"; echo "Goodbye" }; done bash: