what is text editor

While developing a program, it is often necessary to edit it. Editing involves making corrections or modifications to instructions, deletions, and additions of instructions, sequencing instructions etc. A special system program called the editor greatly simplifies the editing tasks. The editor enables the user to retain the program in the memory and modify them as required by specifying the changes to be made. A portion of the memory, called a buffer, is reserved for editing. Lines of instruction are entered from an external I/O device and stored in the buffer by the editor. The editor generally assigns a number to each such line and to each correction or modification. The editor automatically corrects line numbers of instructions or data lines. The edited text can be printed by a printer or recorded on suitable I/O devices.

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