The input output functions like printf(), scanf(), getchar(), putchar(), gets(), puts() are known as console oriented I/O functions which always use keyboard and computer screen as the target place. While using these library functions, the entire data is lost when either the program is terminated or the computer is turned off. Again, it becomes cumbersome and time consuming to handle large volume of data through keyboard. These problems invite concept of data files in which data can be stored on the disks and read whenever necessary, without destroying data. A file is a place on the disk where a group of related data is stored. The data file allows us to store information permanently and to access and alter that information whenever necessary. Programming language C has various library functions for creatin...
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