Question

What header file must be included A) to perform mathematical functions like sqrt? B) to use files? C) to use stream manipluators like setprecision?

Short answer

a) Performing mathematical functions like sqrt b) Working with files c) Using stream manipulators like setprecision Answer: a) To perform mathematical functions like sqrt, include the `` header file. b) To work with files, include the `` header file. c) To use stream manipulators like setprecision, include the `` header file.

Step-by-step solution

Part A: Header file for mathematical functions

To perform mathematical functions like sqrt, the header file to include is the `` header. In C++ programming, by including the `` header file, you gain access to several mathematical functions which are commonly used for various calculations.

Part B: Header file for file handling

To work with files in C++ programming, the header file to include is the `` header. Including the `` header file provides you with the capability to create, read, and write files in a C++ program.

Part C: Header file for stream manipulators

To use stream manipulators like setprecision in C++ programming, you need to include the `` header file. The `` header allows you to manipulate the input and output of data in streams, which can be helpful for formatting, alignment, and precision.