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What is the is the difference between a Semantic error and a Syntax error? What are Imperial officers wearing here? share|improve this answer answered Oct 12 '11 at 7:20 Chris Card 1,82196 1 Error checking is not a criterion for distinguishing between syntax and semantics. But if you are implementing, or discussing, the compiler for that language, then the syntax is the grammar and perhaps type system and the semantics everything built on that.

Expert Search Expert assistance to help you accomplish your business goals faster. In the "x" assignament, "-" means the "substraction" operation, In the "y" assignament, "-" means the "negative sign" operation. A syntax error is a failure of the source code to match the language grammar, for example, not having a semicolon where one is required. A graph of abstract resources as syntax encodes a conceptual model as semantic.

In this case the program does not produce the correct output because the code can not be processed by the compiler or interpreter. Error Recovery and Next: 10.2.1 Syntax Errors 10.2 Syntactic and Semantic Errors There are two kinds of errors that Basis can find. Semantics is what they mean. For example, the concept of pointer arithmetic is part of C's semantics; the way the + and - operators can be used to express pointer operations are part of its syntax.

People usually stop at some level and take it as semantic, but in the end there is no final semantic unless some human being interprets the data in his mind. I mean a paradigm is a set of interrelated semantics? –Gulshan Oct 12 '11 at 6:39 1 @Gulshan, paradigm is a much broader concept than such a formalised thing as It will do something else. For example, the following pseudocode snippet contains a logic error:if (a > b) { print("a is greater than b"); } else { print("a is less than b"); }(The error is

Some semantic checks can be done by the compiler - particularly type checking - so I agree that compilers don't only find syntax errors, but Chris only said "won't find all A semantic error is also called a "logic error;" however, some programmers believe a logic error produces erroneous data, whereas a semantic error yields nothing meaningful at all. And sometimes the line between the two can be blurry. The standard is right, but, my answer was directed to explain a concept, not, following literally, a standard.

the program does not match the specification, or even worse it does not terminate (endless loop). So if you are writing code in a language, the syntax is the language you are using and the desired behaviour is the semantics. It doesn't compile the same syntax differently based on what the developer meant to say, but only on what he typed. Experimental Debugging readers online now | | Back to top © Copyright 2014 Brad Miller, David Ranum, Created using Runestone Interactive.

On the other hand, misinterpreting a variable of a generic type (e.g. The two - operators are the same token, but they're syntactically different, because they're used in different contexts. 0 - 1 matches the syntax rule additive-expression: additive-expression - multiplicative-expression, while - Adding 1 rather than 2 is what I'd call a logical error. –Keith Thompson Oct 13 '11 at 0:37 3 @Keith - but logic (as in "logical error") is semantics. The problem is that the program you wrote is not the program you wanted to write.

Selection 8. And compiler is not doing anything with the syntax straight after the parsing stage - compiler is implementing semantics. These are valid code the compiler understands, but they do not what you, the programmer, intended. Additional semantic checking comes as a cost (ie complexity/readability).

What is the most expensive item I could buy with £50? And yes. An RDF graph (the stuff with URI References) as syntax encodes a graph of abstract resources as semantic. The compiler will detect them, because it can't compile them. 2) Semantic errors.

Error message is obtained.4. However, your program will not do the right thing. Or, perhaps "it's just semantics!" See semantics, semantic attack and syntax error. < Back to List ∧Top A B C D E F G H I J K L M N How to handle a senior developer diva who seems unaware that his skills are obsolete?

The diagnostic information that Basis gives attempts to be as useful as possible, but because of the very limited context information available, it is far from perfect. This type of error is not caught during compilation, but causes an exception to be thrown at runtime. Yet the compiler has only syntax to work with. Recursion 14.

Simple Python Data 3. But if you want to make a sharp distinction between errors that a compiler must detect and errors that it needn't detect, then I think "semantic" vs. "logical" is a good The meaning of the program (its semantics) is wrong. The syntax of the source code may be valid, but the algorithm being employed is not.

share|improve this answer answered Oct 12 '11 at 12:10 kylben 2,118813 "Syntax is what the computer understands, semantics is what the human understands" is a great oversimplification. The choice of language is largely about how easily and efficiently the semantics you want to use can be expressed in its syntax. What's the difference? Such things as incorrect variable types or sizes, nonexistent variables, subscripts out of range, and the like, are semantic errors.

Semantics are an individuals own interpretation of the meaning of a "sentence" based on their prior knowledge. share|improve this answer edited Mar 15 '13 at 8:29 Kilian Foth 65.6k19179212 answered Mar 15 '13 at 7:26 IcyFlame 24325 3 Down voter: explain why you have down voted. –IcyFlame C# and VB.NET - both use value types and reference types, but the characters you type to define them are different); in other cases, two languages are syntactically similar, but the