What happens when a logical error occurs?
Logical errors are the most difficult to fix. They occur when the program runs without crashing, but produces an incorrect result. The error is caused by a mistake in the program's logic. You won't get an error message, because no syntax or runtime error has occurred.
In computer programming, a logic error is a bug in a program that causes it to operate incorrectly, but not to terminate abnormally (or crash). A logic error produces unintended or undesired output or other behaviour, although it may not immediately be recognized as such.
- There are three types of error: syntax errors, logical errors and run-time errors. (Logical errors are also called semantic errors). We discussed syntax errors in our note on data type errors.
- Desk checking is an informal manual test that programmers can use to verify coding and algorithm logic before a program launch. This enables them to spot errors that might prevent a program from working as it should.
- Definition of: semantic error. semantic error. Writing invalid program logic that produces incorrect results when the instructions are executed. The syntax of the source code may be valid, but the algorithm being employed is not.
There are generally two types of errors: syntax errors and logic errors. Syntax errors occur when a program does not conform to the grammar of a programming language, and the compiler cannot compile the source file. Logic errors occur when a program does not do what the programmer expects it to do.
- A parse-time error occurs when the syntax of the program is incorrect. (This is also called a compile-time error for languages such as C/C++ and Java.) A parse-time error is the easiest error to correct because the parser (or compiler) tells you exactly what is wrong and on what line the problem occurs.
- In computer programming, a comment is a programmer-readable explanation or annotation in the source code of a computer program. They are added with the purpose of making the source code easier for humans to understand, and are generally ignored by compilers and interpreters.
- Debugging is the routine process of locating and removing computer program bugs, errors or abnormalities, which is methodically handled by software programmers via debugging tools. Debugging checks, detects and corrects errors or bugs to allow proper program operation according to set specifications.
Updated: 2nd October 2019