Introduction Solution The reason you’re getting the compiler error is that you’ve pushed the generic constrains to the individual methods rather than putting the restraint on the class. The way you have it, there’s no way to override the intrinsically generic method GetOrderingFunc<T> with a method that returns a Expression<Func<User, string>>. What you’ve posted works … Read more
Introduction Solution You can do it easily with XDocument var xDocument = XDocument.Parse(@”<configuration> <property> <name>name</name> <value>dinesh</value> </property> <property> <name>city</name> <value>Delhi</value> </property> </configuration>”); var firstPropertyElement = xDocument .Descendants(“property”) .First();//Find your element var xComment = new XComment(firstPropertyElement.ToString());//Create comment firstPropertyElement.ReplaceWith(xComment);//Replace the element with comment Console.WriteLine(xDocument); Which outputs: <configuration> <!–<property> <name>name</name> <value>dinesh</value> </property>–> <property> <name>city</name> <value>Delhi</value> </property> </configuration>
Introduction Solution Don’t use special shell characters in your file names. & is special, so C&Cpp will bite you, again and again and again and again AND AGAIN AND AGAIN. Special shell characters in filenames are not illegal, and you can use them if you really want to, but… The alternative is to fix all … Read more
Introduction Solution #include<iostream> using namespace std; void initarray(int a[], int n) { for(int i = 0; i<n; i++) { a[i]=0; } } void acceptarray(int a[], int n) { for(int i = 0; i<n; i++) { cin >> a[i]; } } int pivotelement(int a[], int n) //function has return type int so return the index of … Read more
Introduction Solution class MainClass { public static void Main (string[] args) { int counter = 1; do { for (int i = 0; i < counter; i++) { Console.Write(“*”); } Console.WriteLine(); // for newline counter++; // increase counter } while (counter < 6); } } sorry for my bad english. You can use a counter … Read more
Introduction Array of arrays, or “nested arrays,” is a powerful concept in programming that allows for the storage of multiple sets of data in a single array. This concept can be used to store complex data structures, such as a list of lists, or a matrix. However, when using the “newing” syntax to create an … Read more
Introduction C++ is a powerful programming language that allows developers to create complex applications. One of the most important aspects of C++ is its ability to compare different types of variables. However, it is important to note that C++ does not allow for the comparison of different types of variables. This means that if you … Read more
Introduction The C#6 “Using static” feature is a great way to simplify your code and make it easier to read. It allows you to access static members of a type without having to specify the type name. This can be especially useful when dealing with large namespaces or when you want to avoid typing out … Read more
Introduction Validating phone and telephone numbers of Hong Kong with a country code using regular expressions (regex) can be a daunting task. However, with the right knowledge and understanding of regex, it can be done quickly and accurately. In this article, we will discuss the basics of regex and how to use it to validate … Read more
Because the expression num1++ evaluates to num1. You may want to do: ++num1 which evaluates to num1 + 1. Note however that both expressions increment num1 by one. Evaluating num1 in the next statement evalutes to the incremented value. In short In C, why doesn’t num1++ increment in the printf()? num1++ does increment num1 but … Read more
–> is not an operator. It is in fact two separate operators, — and >. The conditional’s code decrements x, while returning x‘s original (not decremented) value, and then compares the original value with 0 using the > operator. To better understand, the statement could be written as follows: while( (x–) > 0 ) 4 … Read more
Introduction The ‘–>’ operator is a pointer operator in C/C++. It is used to access the members of a structure or union. It is also known as the structure dereference operator and is used to access the members of a structure or union through a pointer. This operator is used to access the members of … Read more
fopen, calloc, and realloc can all fail, returning NULL. In the case of realloc, the original allocation will remain untouched, so immediately overwriting the original pointer with the newly returned value will leak memory and throw away potentially useful data. Reallocating every iteration is rather costly. A better strategy is to reallocate when the buffer … Read more
Your code exhibits undefined behaviour because you passed a non-static, uninitialised pointer to realloc whose contents were indeterminate. From C11, Memory Management Functions: The realloc function deallocates the old object pointed to by ptr and returns a pointer to a new object that has the size specified by size. ….if ptr does not match a … Read more
When processing regular characters (final else clause) you read additional input instead of operating over text, i.e. instead of: scanf(“%c”, &document[parano][sentno][wordno][charno]); printf(“%c\n”, document[parano][sentno][wordno][charno]); charno++; you want to do: document[parano][sentno][wordno][charno++] = text[i]; By the time we hit text[i] == ‘ ‘ for the first time the value of ***document is “3\n1 2\n2\n” but you wanted it … Read more