parameters

问题 The following is a perfectly legal C++ code void foo (int) { cout << "Yo!" << endl; } int main (int argc, char const *argv[]) { foo(5); return 0; } I wonder, if there a value to ever leave unnamed parameters in functions, given the fact that they can't be referenced from within the function. Why is this legal to begin with? 回答1: Yes, this is legal. This is useful for implementations of virtuals from the base class in implementations that do not intend on using the corresponding parameter: you

问题 The following is a perfectly legal C++ code void foo (int) { cout << "Yo!" << endl; } int main (int argc, char const *argv[]) { foo(5); return 0; } I wonder, if there a value to ever leave unnamed parameters in functions, given the fact that they can't be referenced from within the function. Why is this legal to begin with? 回答1: Yes, this is legal. This is useful for implementations of virtuals from the base class in implementations that do not intend on using the corresponding parameter: you

问题 Consider the method declaration: String.format(String, Object ...) The Object ... argument is just a reference to an array of Object s. Is there a way to use this method with a reference to an actual Object array? If I pass in an Object array to the ... argument - will the resultant argument value be a two-dimensional array - because an Object[] is itself an Object : Object[] params = ....; // Make the array (for example based on user-input) String s = String.format("%S has %.2f euros",

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 4 years ago . Locked . This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. Routines can have parameters, that's no news. You can define as many parameters as you may need, but

问题 I am sending an url parameter to servlet using the following jQuery piece: $.getJSON("http://localhost:8080/JsoupPrj/JasonGen?url=" + url, function(data) { $("#content").html(data); }); On the server side, the servlet gets the parameter, for that I coded as below: String url = (String) request.getAttribute("url"); But it is not working, can you tell me where I am doing wrong? I believe I am not passing the parameter properly to the servlet. The servlet triggers each time through the

问题 How can I use a parameter inside sql openquery, such as: SELECT * FROM OPENQUERY([NameOfLinkedSERVER], 'SELECT * FROM TABLENAME where field1=@someParameter') T1 INNER JOIN MYSQLSERVER.DATABASE.DBO.TABLENAME T2 ON T1.PK = T2.PK 回答1: From the OPENQUERY documentation it states that: OPENQUERY does not accept variables for its arguments. See this article for a workaround. UPDATE: As suggested, I'm including the recommendations from the article below. Pass Basic Values When the basic Transact-SQL

问题 How can I use a parameter inside sql openquery, such as: SELECT * FROM OPENQUERY([NameOfLinkedSERVER], 'SELECT * FROM TABLENAME where field1=@someParameter') T1 INNER JOIN MYSQLSERVER.DATABASE.DBO.TABLENAME T2 ON T1.PK = T2.PK 回答1: From the OPENQUERY documentation it states that: OPENQUERY does not accept variables for its arguments. See this article for a workaround. UPDATE: As suggested, I'm including the recommendations from the article below. Pass Basic Values When the basic Transact-SQL

问题 I've got a string in .NET which is actually a url. I want an easy way to get the value from a particular parameter. Normally, I'd just use Request.Params["theThingIWant"] , but this string isn't from the request. I can create a new Uri item like so: Uri myUri = new Uri(TheStringUrlIWantMyValueFrom); I can use myUri.Query to get the query string...but then I apparently have to find some regexy way of splitting it up. Am I missing something obvious, or is there no built in way to do this short

问题 I've got a string in .NET which is actually a url. I want an easy way to get the value from a particular parameter. Normally, I'd just use Request.Params["theThingIWant"] , but this string isn't from the request. I can create a new Uri item like so: Uri myUri = new Uri(TheStringUrlIWantMyValueFrom); I can use myUri.Query to get the query string...but then I apparently have to find some regexy way of splitting it up. Am I missing something obvious, or is there no built in way to do this short

问题 In my Orange class I have this method: public static List<Orange> AddOrange() { List<Orange> oranges = new List<Orange>(); oranges.Add(new Orange() { Weight = 150, Measure = 6 }); oranges.Add(new Orange() { Weight = 160, Measure = 6 }); oranges.Add(new Orange() { Weight = 160, Measure = 6 }); oranges.Add(new Orange() { Weight = 150, Measure = 6 }); oranges.Add(new Orange() { Weight = 160, Measure = 6 }); oranges.Add(new Orange() { Weight = 160, Measure = 6 }); return oranges; } And in my