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Input Functions:

The functions which are used to enter the data in program,to enter data from user or programmer are called input functions.Some input functions are given below.
1.cin>>(iostream header file is use for this function)
2.scanf()(stdio.h header file is use for this function)

Output Functions:

The functions which are used to show the ouput on console screen,are called ouput functions.Some output functions are given below.
1.cout<<(iostream header file is use for it).
2.printf()(stdio.h header file is use for it).