The header file iomanip provides a set of functions called manipulators which can be used to the manipulate the output formats. They provide in the c++ language the same features as that of the ios(Input output system) member functions and flags. and in c++ language Some manipulators are more convenient to use than their counterparts in the class(Input output system) ios. such that, two or more manipulators can be used as a chain in one statement as shown below:
This kind of concatenation is useful when we want to display several columns of output.The most commonly used manipulators are shown in Table10.6. The table also gives their meaning and equivalents. To access these manipulators, we must include the file iomanip in the program.