Theory

These are the hardest errors to spot. This is when the program works perfectly but doesn’t give the correct answer. The programmer has made a mistake in the way it should work

• Logic errors

• Run-time errors

• Syntax errors

To spot ................. errors, programmers will often try out programs to see if they will work by dry running the program. They work through the program one line at a time and record the values of each variable in a trace table.

• syntax errors

• logic errors

• run-time errors

............... this is when you make mistakes in writing the correct programming language. When you try running the program, the computer will tell you there is something wrong because it cannot understand the language you have used.

• Logic errors

• Run-time errors

• Syntax errors

These happen when the computer tries to do something that is impossible e.g. divide by zero or open a file that doesn’t exist. Robust computer code (we’ll deal with this later) will make sure these don’t happen.

• Syntax errors

• Logic errors

• Runtime errors

A variable which is defined in the main program.

• Local variable

• Global variable

A variable which is defined in the procedure- these cannot be used anywhere else unless they become global or are passed somewhere else.

• Local variable

• Global variable

A procedure that can also return data back into the main program.

• Function

• Procedure

• Global

• Local

......... is a named variable passed into a function

• Parameter

• Argument

• Global

• Local

The data that is passed to a function

• Parameter

• Argument

• Global

• Local

Data that is valid but is on the limit of being acceptable.

• Invalid data

• Boundary data

• Erroneous