Why format specifier is not necessary in language C plus plus?

Answer 1

Format specifiers are not necessary because we can use the much more flexible insertion operator to insert formatted text in an output stream, or the extraction operator to extract formatted data from an input stream. Format specifiers are simply far too low-level and can only handle built-in data types such as strings, integrals and floats, they cannot handle more complex data types such as classes and data structures and we cannot create new specifiers to cater for them. But in C++ we can simply overload the insertion and extraction operators to cater for any data type we wish, thus providing a consistent means of inserting any object into an input stream or extracting it from an output stream.