switch-statement

问题 Through a little typo, I accidentally found this construct: int main(void) { char foo = 'c'; switch(foo) { printf("Cant Touch This\n"); // This line is Unreachable case 'a': printf("A\n"); break; case 'b': printf("B\n"); break; case 'c': printf("C\n"); break; case 'd': printf("D\n"); break; } return 0; } It seems that the printf at the top of the switch statement is valid, but also completely unreachable. I got a clean compile, without even a warning about unreachable code, but this seems

问题 Through a little typo, I accidentally found this construct: int main(void) { char foo = 'c'; switch(foo) { printf("Cant Touch This\n"); // This line is Unreachable case 'a': printf("A\n"); break; case 'b': printf("B\n"); break; case 'c': printf("C\n"); break; case 'd': printf("D\n"); break; } return 0; } It seems that the printf at the top of the switch statement is valid, but also completely unreachable. I got a clean compile, without even a warning about unreachable code, but this seems

问题 Current assignment needs me to write a program to read a file with instructions in a very tiny and basic programming language (behaves a little like FORTRAN) and execute those instructions. Basically it's a simple interpreter for the language I guess. It's completely linear, with statements all being defined in sequence and it only has String and integer variables. There are 8 keywords and 4 arithmetic operators I would need to find and define if they exist within the source file, and each

问题 I'm creating a chess game with java. As you know when you start out the chess game you have two of each "Captains" (sorry I'm not sure what the term is) I have created the following switch case to create the graphical layout of the figures: switch (j) { case 1 || 8 : Rook tower = new Rook(""); return tower.getBrik(); case 2 || 7 : case 3 || 6 : Bishop bishop = new Bishop(""); return bishop.getBrik(); case 4 : King king = new King(""); return king.getBrik(); case 5 : Queen queen = new Queen(""

问题 I recently read the questions that recommend against using switch-case statements in languages that do support it. As far as Python goes, I've seen a number of switch case replacements, such as: Using a dictionary (Many variants) Using a Tuple Using a function decorator (http://code.activestate.com/recipes/440499/) Using Polymorphism (Recommended method instead of type checking objects) Using an if-elif-else ladder Someone even recommended the Visitor pattern (Possibly Extrinsic) Given the

问题 I recently read the questions that recommend against using switch-case statements in languages that do support it. As far as Python goes, I've seen a number of switch case replacements, such as: Using a dictionary (Many variants) Using a Tuple Using a function decorator (http://code.activestate.com/recipes/440499/) Using Polymorphism (Recommended method instead of type checking objects) Using an if-elif-else ladder Someone even recommended the Visitor pattern (Possibly Extrinsic) Given the

问题 I have a JSON in the next form: { "conditions": [ { "id": "123", "type": "a", entities: ["529", "454"] }, { "id": "124", "type": "b", entities: ["530", "455"] } ] } I want to create relation ship between the Condition node with node A Entities or node B entities based on type attribute which can be A/B i Assuming that these entities already exists in neo4j. I am trying something like the below cypher but that doesn't work. WITH {json} as data UNWIND data.conditions as condition MATCH (c

问题 I recently got into an argument over how switch handles comparisons, and need help settling it. If I write a switch such as: switch ($x){ case ($x > 5): echo "foo"; break; case ($x < 5): echo "bar"; break; default: echo "five"; break; } Which if statement is it equivalent to? A or B ? // A if ($x > 5) { echo "foo"; } elseif ($x < 5) { echo "bar"; } else { echo "five"; } // B if ($x == ($x > 5)) { echo "foo"; } elseif ($x == ($x < 5)) { echo "bar"; } else { echo "five"; } 回答1: To everyone, let

问题 Briefly: I would like to turn on a relay for 30 seconds, after I toggle a switch on. I'm trying to do a blinds automation at home. I have a simple ON-OFF-ON switch, attached to an Arduino connected to Relays. I want to turn on Relay#1 for a maximum of 30 seconds if I toggle the switch down from center. In other words, relay turns on when I switch, and when timer reaches 30 seconds relay turns off. similarly I want to turn on Relay#2 for exactly 30 seconds if I toggle the switch up from center

问题 I've got results being returned to a Google Mapping application in the div sidebar. The results are names of businesses that belong to categories that the client wants returned in a certain order. And unfortunately it's not a straight alpha sort. So one category begins with F and the second one with a C and the last three are A's, for example. So I need my switch, which works, but naturally insists on dropping the values in alpha sorted (as they are returned from the DB that way) order as