File is a group of data with the same type in certain amount. There are 2 kinds of file, file program and file data. File program is a group of data that form a program, whether file data is a group of data with the same type.
Type of file data in the form of integer, text, real, array, or record. Commonly, used in the form of record type, so it called record group and record of field group. There are 3 kinds of file organization:
1. Sequential
2. Random
3. Indexed Sequential
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