Why do we need data files?What are the different file opening modes?Write a program that reads data from a file "input.txt" and writes to "output.txt" file.[2+3+5]

--- (a) Why Do We Need Data Files? When a program runs, all data is stored in main memory (RAM), which is volatile -- it is lost when the program ends or the computer is switched off. Data files solve this problem by providing permanent storage on secondary storage devices (hard disk, etc.). Reas...