if-statement

问题 I am trying to do the bellow: setlocal enabledelayedexpansion set choice= set /p choice="Select File Number, or no to exit: " if "%choice%"=="no" ( goto cleanup ) else ( set "!choice!=%choice%" start %file!choice!% pause ) what i want is to open a file where the variable is %filex% and be able to choose what file to open 来源： https://stackoverflow.com/questions/60470710/making-a-variable-dynamic-in-if-statement

问题 In perl, $x = if (0) {1} else {2} does not work. $ perl -E'$x = if (0) {1} else {2}' syntax error at -e line 1, near "= if" Execution of -e aborted due to compilation errors. This makes sense, because if conditionals are not expressions in Perl. They're flow control. But then my $x = do { if (0) {1} else {2} }; Does work! How come a do BLOCK can accept an if conditional? But assignment can not? It would seem in the above the flow control must either know it's context in a do BLOCK always act

问题 In perl, $x = if (0) {1} else {2} does not work. $ perl -E'$x = if (0) {1} else {2}' syntax error at -e line 1, near "= if" Execution of -e aborted due to compilation errors. This makes sense, because if conditionals are not expressions in Perl. They're flow control. But then my $x = do { if (0) {1} else {2} }; Does work! How come a do BLOCK can accept an if conditional? But assignment can not? It would seem in the above the flow control must either know it's context in a do BLOCK always act

问题 Here is my function: function reCalculate(i) { document.getElementById("Q" + i).value = document.getElementById("C" + i).value - document.getElementById("QA" + i).value; if (document.getElementById("Q" + i).value < 0) { document.getElementById("Q" + i).value = 0; } if (document.getElementById("Q" + i).value < document.getElementById("E" + i).value && document.getElementById("Q" + i).value != 0) { alert(document.getElementById("Q" + i).value + " is less than " + document.getElementById("E" + i

问题 So, I have a series of actions to perform, based on 4 conditional variables - lets say x,y,z & t. Each of these variables have a possible True or False value. So, that is a total of 16 possible permutations. And I need to perform a different action for each permutation. What is the best way to do this rather than making a huge if-else construct. Lets see a simplified example. This is how my code would look if I try to contain all the different permutations into a large if-else construct. if

问题 So, I have a series of actions to perform, based on 4 conditional variables - lets say x,y,z & t. Each of these variables have a possible True or False value. So, that is a total of 16 possible permutations. And I need to perform a different action for each permutation. What is the best way to do this rather than making a huge if-else construct. Lets see a simplified example. This is how my code would look if I try to contain all the different permutations into a large if-else construct. if

问题 So, I have a series of actions to perform, based on 4 conditional variables - lets say x,y,z & t. Each of these variables have a possible True or False value. So, that is a total of 16 possible permutations. And I need to perform a different action for each permutation. What is the best way to do this rather than making a huge if-else construct. Lets see a simplified example. This is how my code would look if I try to contain all the different permutations into a large if-else construct. if

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I have a strange problem with an if statement. I'm checking if a Boolean is true, if it is the if statement must run. I System.out.println the value of the boolean at a lot of places, its always false but the if statement still runs. Any help ? import java.util.ArrayList; public class GameLoop extends Thread {

问题 Hi I am trying to split the values in a (y2) list into (inv) amount of parts. x = [0,100,200,300,400,500,600,700,800,900,1000,1100] y2 = [58,55,49,12,6,5,4,4.5,35,48,56,58] interval = 5 inv = (x[0] + x[1])/interval I will like to split y2 into inv parts so my answer should be: [58 57.85 57.7 57.55 57.4 57.25 57.1 56.95 56.8 56.65 56.5 56.35 56.2 56.05 55.9 55.75 55.6 55.45 55.3 55.15 55...…….49...…………..12...….6 ………...5...……..] I will like to mention that inv will always be (x[0] + x[1])

问题 Hi I am trying to split the values in a (y2) list into (inv) amount of parts. x = [0,100,200,300,400,500,600,700,800,900,1000,1100] y2 = [58,55,49,12,6,5,4,4.5,35,48,56,58] interval = 5 inv = (x[0] + x[1])/interval I will like to split y2 into inv parts so my answer should be: [58 57.85 57.7 57.55 57.4 57.25 57.1 56.95 56.8 56.65 56.5 56.35 56.2 56.05 55.9 55.75 55.6 55.45 55.3 55.15 55...…….49...…………..12...….6 ………...5...……..] I will like to mention that inv will always be (x[0] + x[1])