Computer applications generally involve tremendous amount of data to be read from input devices and sending them to the output devices. Hence, to control such operations, every programming language provides a set of inbuilt functions. C++ supports all input/output (I/O) functions of C. C++ also has library functions. A library is a set of .obj files, which is linked to the program and gives additional beneficial support with its functions. The programmer can use the library functions in the programs. The library is also called as iostream library. The Âdifference between C and C++ I/O function is that C functions do not support object-oriented platform whereas C++ supports object-oriented platform.