ternary-operator

No implicit int -> short conversion in ternary statement

这一生的挚爱 提交于 2019-11-26 14:47:33
问题 short s; s = (EitherTrueOrFalse()) ? 0 : 1; This fails with: error CS0266: Cannot implicitly convert type 'int' to 'short'. An explicit conversion exists (are you missing a cast?) Can anyone explain why this is so? The only thing I can think of is that the compiler doesn't look at the second value and doesn't know the range between the two, in the case I wrote something like short s; s = (EitherTrueOrFalse()) ? 0 : 65000; Correct? The only fix is with an ugly cast? Also, it seems C# does not

Java Ternary without Assignment

爷,独闯天下 提交于 2019-11-26 14:42:57
Is there a way to do a java ternary operation without doing an assignment or way to fake the assingment? I like how succinct ternary code looks when doing a bunch of if/then/elses. I'm hoping to be able to call one of two void functions based on a boolean algebra statement. Something like: (bool1 && bool2) ? voidFunc1() : voidFunc2(); My functions are of return type void , so if there is a way to fake this in an assignment to make it work, then I"m okay with that... I would like to see how to do it though :) Nope you cannot do that. The spec says so . The conditional operator has three operand

Error: lvalue required in this simple C code? (Ternary with assignment?)

和自甴很熟 提交于 2019-11-26 14:40:51
I have : #include<stdio.h> int main() { int a=5,b=6; (a>b)?b=a:b=b; // Here is the error return 0; } But if I replace : (a>b)?b=a:b=b; // Error with (a>b)?(b=a):(b=b); // No-Error I understand the lvalue is a value to which something can be assigned and how is it different from rvalue , but why is the extra parenthesis making the difference. Assignment has a lower precedence than the ternary operator so the line evaluates like: ((a>b)?b=a:b)=b; use: b=(a>b)?a:b; Nawaz Actually, in C, this code (a>b)?b=a:b=b; is parsed by many compilers as ((a>b)?b=a:b)=b; which is an error, as the expression (

Speed difference between If-Else and Ternary operator in C…?

流过昼夜 提交于 2019-11-26 14:23:22
问题 So at the suggestion of a colleague, I just tested the speed difference between the ternary operator and the equivalent If-Else block... and it seems that the ternary operator yields code that is between 1x and 2x faster than If-Else. My code is: gettimeofday(&tv3, 0); for(i = 0; i < N; i++) { a = i & 1; if(a) a = b; else a = c; } gettimeofday(&tv4, 0); gettimeofday(&tv1, 0); for(i = 0; i < N; i++) { a = i & 1; a = a ? b : c; } gettimeofday(&tv2, 0); (Sorry for using gettimeofday and not

?: ternary conditional operator behaviour when leaving one expression empty

我与影子孤独终老i 提交于 2019-11-26 13:29:52
I was writing a console application that would try to "guess" a number by trial and error, it worked fine and all but it left me wondering about a certain part that I wrote absentmindedly, The code is: #include <stdio.h> #include <stdlib.h> int main() { int x,i,a,cc; for(;;){ scanf("%d",&x); a=50; i=100/a; for(cc=0;;cc++) { if(x<a) { printf("%d was too big\n",a); a=a-((100/(i<<=1))?:1); } else if (x>a) { printf("%d was too small\n",a); a=a+((100/(i<<=1))?:1); } else { printf("%d was the right number\n-----------------%d---------------------\n",a,cc); break; } } } return 0; } More specifically

corresponding nested ternary operator in php?

风流意气都作罢 提交于 2019-11-26 12:49:19
问题 I want to convert following if else condition to nested ternary operator. if ($projectURL) { echo $projectURL; } elseif ($project[\'project_url\']) { echo $project[\'project_url\']; } else { echo $project[\'project_id\']; } I have written like following. echo ($projectURL)?$projectURL:($project[\'project_url\'])?$project[\'project_url\']: $project[\'project_id\']; But it is found as not working properly.Is this not a right way? 回答1: Ternary operators are tricky thing in PHP, as they are left

Type result with conditional operator in C#

微笑、不失礼 提交于 2019-11-26 12:47:02
问题 I am trying to use the conditional operator, but I am getting hung up on the type it thinks the result should be. Below is an example that I have contrived to show the issue I am having: class Program { public static void OutputDateTime(DateTime? datetime) { Console.WriteLine(datetime); } public static bool IsDateTimeHappy(DateTime datetime) { if (DateTime.Compare(datetime, DateTime.Parse(\"1/1\")) == 0) return true; return false; } static void Main(string[] args) { DateTime myDateTime =

How does the ternary operator work?

青春壹個敷衍的年華 提交于 2019-11-26 12:31:31
Please demonstrate how the ternary operator works with a regular if/else block. Example: Boolean isValueBig = value > 100 ? true : false; Exact Duplicate: How do I use the ternary operator? Boolean isValueBig = ( value > 100 ) ? true : false; Boolean isValueBig; if( value > 100 ) { isValueBig = true; } else { isValueBig = false; } The difference between the ternary operation and if/else is that the ternary expression is a statement that evaluates to a value, while if/else is not. To use your example, changing from the use of a ternary expression to if/else you could use this statement: Boolean

Why does the ternary operator unexpectedly cast integers?

落爺英雄遲暮 提交于 2019-11-26 11:48:15
I have seen it discussed somewhere that the following code results in obj being a Double , but that it prints 200.0 from the left hand side. Object obj = true ? new Integer(200) : new Double(0.0); System.out.println(obj); Result: 200.0 However, if you put a different object in the right hand side, e.g. BigDecimal , the type of obj is Integer as it should be. Object obj = true ? new Integer(200) : new BigDecimal(0.0); System.out.println(obj); Result: 200 I presume that the reason for this is something to do with casting the left hand side to a double in the same way that it happens for integer

doing comparison if else in JasperReports

﹥>﹥吖頭↗ 提交于 2019-11-26 11:28:43
问题 I want to do a comparison such as: if <field> == 0 then \"-\" Can somebody tell me the syntax using JasperReports? 回答1: iReport (JasperReports) uses a Ternary operator. For example, consider the following logic: IF boolean condition THEN execute true code ELSE execute false code END IF Using a ternary operator, this becomes: boolean condition ? execute true code : execute false code When using a variable with the following expression: $F{column_value}.intValue() == 42 ? "Life, Universe,