Common C++ Built-in Functions: The commonly used built-in functions are discussed below: The “conio.h” Function: The “conio.h” stands for console input/output. This header file contains basic input & output functions that are used to get data from the keyboard and to send results from the memory to the output screen. A brief description of commonly used functions of this header file is... 

C++ Built-In Function: The functions that have already been defined and are part of the language and can be used in any program are called built-in functions. Accessing Built-in Functions: The built-in functions are accessed through header files. Each built-in function is defined in its related header file. If a built-in function is to he used in a program, its header tiles must be included in...