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What is the role of the grep function in the Perl programming language?
The grep function in Perl is the command-line function which can be used to search in a data set for lines which match a regular expression. The grep function is essentially a tool that can be used to search for particular information within the data.
Why can't the accessor member function change any of the values in a class in C plus plus?
Nothing stops a member function from changing any of the values in a class. By convention, an accessor function is used to give read only access to class data, but that does not mean that it is prohibited from doing so. It is a member function, after all, and it has all the rights of any member function of the class.
What is clear in c plus plus?
clear() is an inbuilt function defined in c++ defined in conio.h. It is used for clearing the console. The systax is:clear();
When to create a template function?
A template function is used when you want to write some kind of function that can be applied to different data types. It is a form of overloading, but you don't have to actually write all of the overloaded variants.
To read data which is superior 1. input stream 2. file reader?
First of all, these two classes are on different levels of abstraction. An InputStream is used for reading any stream of bytes, while a FileReader is used to read characters from a file. If you want to ask between a FileInputStream and a FileReader, then we need to look at what type of data you are reading. If you're reading plain-text file, for example, you want to use a FileReader because it was designed to read in characters. For other types of data, the FileInputStream would be better, as it is used to read in generic streams of bytes from a file.
