Computer Programming I_10

Files
Two types of files in QBASIC:
1. Program File:
Program file contains a set of instructions. (QBASIC Commands). Extension is “.bas”
2. Data File:
Data file is the file that stores data permanently which are required for data processing. Extension is “.dat” or any three letter extension. Data stored in a row, which is known as record. Data field may contain many records. Each Data of record is known as field.
Opening a data file:
OPEN "student.dat" FOR OUTPUT As #1
Open in OUTPUT mode - new data file created and assigned 1 as a file number (File number can be 1 to 255).
OPEN "student.dat" FOR INPUT As #2
Opens an existing data file - can retrieve records of data and manipulate info.
Closing a data file:
CLOSE #1, #3
Closes both data files which have file numbers 1 and 3
CLOSE
Closes all opened data files.

Files
Two types of files in QBASIC:
1. Program File:
Program file contains a set of instructions. (QBASIC Commands). Extension is “.bas”
2. Data File:
Data file is the file that stores data permanently which are required for data processing. Extension is “.dat” or any three letter extension. Data stored in a row, which is known as record. Data field may contain many records. Each Data of record is known as field.
Opening a data file:
OPEN "student.dat" FOR OUTPUT As #1
Open in OUTPUT mode - new data file created and assigned 1 as a file number (File number can be 1 to 255).
OPEN "student.dat" FOR INPUT As #2
Opens an existing data file - can retrieve records of data and manipulate info.
Closing a data file:
CLOSE #1, #3
Closes both data files which have file numbers 1 and 3
CLOSE
Closes all opened data files.