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and run the program
FoxBASE utility design skills
Hebei Dushi learn
1994-03-11
● establish appropriate batch file create the appropriate batch
processing documents, give the system assembly, recovery, backup, and run the rosetta stone spanish program, print, copy, and so bring great convenience.
● Proper use the SET command group
SET command group consisted of 36 commands can be set using the SET command to set system parameters, and enhance the functionality of the program, so the group known as the SET command status is set, the software "switch", proper understanding of the use of the SET command group, a great advantage for beginners.
● Comment statements are used.
program at the beginning or middle of using the appropriate comment statements, the program can read the content clear and easy to understand.
● reasonably named file names, variable names, field names
in program design, the file name if a uniform format definition, it will file a copy of the directory listing, and delete a tremendous convenient. In kaspersky internet security 2013 addition, the program variable names used in the database field names used in a reasonable manner defined, try to make it a regular, so that the program can not only clear, but also easy access to the memory file.
Second, the program design of the special handling techniques
● flexibility to use macro substitution function &
flexibility to use macro substitution function &, can greatly reduce the amount of re-entering the program, the program simplification, optimization have played a significant role. There are four main methods used:
■ flexibility to open any one data file.
■ use macro substitution function & replace command line.
■ use macro substitution function norton internet security 2013 & Alternative expressions.
■ participate in the string into data calculation.
● module debugging and FoxBLAND alone
joint use of modular construction program has many unique advantages, has a strong independence, can be modified, but due to excessive presence of modules, system operation takes longer period of time, in order to solve this problem, each sub-module can be debugged separately and after the system is running, call FoxBASE software tools FoxBLAND tuned to the sub-modules combined into one process documentation in order to reduce the number of open files, Thus, while maintaining the independence of program modules, has referred to the high operating speed of the entire program.
● Using loops
use are mainly the following:
■ Using looping statements to a group of ordinal variables set the initial value.
■ loop for array processing, paying particular attention to the position of the record pointer.
■ Use the control loop delay, the information on the screen there is a certain residence time, can be combined with the WAIT statement.
Note that when using the loop, loop start position to give special consideration to prevent "death cycle."
● TYPE () function is used
FoxBASE a rich set of functions, TYPE () is one of them. In the program, first with the TYPE () function to norton internet security 2013 test for conditional expression is recognized as a logical expression, then use display plus FOR or WHILE statement, phrase queries, so that the program can greatly reduce abnormal interruption.
● multi-process procedures to achieve
FoxBASE system through the ON ESCA, ON norton 360 support KEY, ON ERROR three programming commands, provides us with a multi-channel simulation program with
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