Types of error.

Types of error.

System errors affect the computer on its peripherals. For example, you might have written a program, which needs access to a printer. If there is no printer present when you run to the program, the computer will produce a system error message. Sometimes a system error makes the computer stop working altogether and you will have to restart the computer. A sensible way of avoiding system error is to write code to check that peripherals are present before any data is sent to it. Then the computer would warn you by a simple message on the screen, like “printer is not ready or available”.

Syntax errors are mistakes in the programming language (like typing RPINT instead PRINT). Syntax errors cause the program to fail. Some translator programs won’t accept any line that has syntax errors. Some only report a syntax error when they run the program. Some languages contain special commands such as debug, which will report structural errors in a program. The programming manual for the particular language you’re using will give details of what each error message means.

Mistakes that are much more difficult to detect than syntax errors called logic errors. This is because a program containing logic error will run, but it won’t work properly. For example, you might write a program to clear the screen and then print “hello”. Here is a code for this:

10 // message 30 CLS

20 PRINT ‘Hello’ 40 END

This code has a logic error in it, but the syntax is right so it will run. You can get rid of logic errors from simple program by “hand-testing” them or doing a “dry run” which means working through each line of the program on paper to make sure it does what you want it to do. You should do this long before you type the code.

1. Выписать, перевести и выучить подчёркнутые слова и выражения.

2. Перевести письменно текст.

3. Составить 6 вопросов к тексту.

4. Пересказать текст.

12 3 Следующая ⇒