What is semantic and syntactic?

Answer 1

Syntax refers to the set of rules that govern what sequences of symbols are valid programs or not. Semantics refers to what the various syntactic constructs actually mean, what they do, and so on.

Answer 2

A semantic describes the meaning behind program code while the syntax describes the means by which that semantic may be expressed in a specific language. That is, each programming language has its own syntax rules, but they can all be used to express the same semantic; the language syntax merely dictates how that semantic is symbolised in code.

As a simple example, most programming languages will provide some means of performing a simple loop. A loop that executes exactly 10 times is a semantic. In C++ we might express that semantic as follows:

for (int x=1; x<=10; ++x) {

// do something...

}

But this syntax does not work in BASIC, where we might write the following instead:

FOR x=1 TO 10

REM do something...

NEXT x

Another way of looking at it is that a syntax error is usually a compile time error whereas a semantic error is usually a runtime error. To use an analogy, the phrase "back-to-back they faced each other" is syntactically correct according to the grammar of the English language, but semantically it makes no sense.

Answer 3

Semantics deals with word meanings. Syntactic deals with word order and the way phrases and sentences are put together.

Answer 4

The syntax defines the rules of a language; the semantics describe the meaning of a statement in a language.

Answer 5

Syntax are the grammar rules...

and semantics are method

Answer 6

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