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To illustrate this, consider the [[C (programming language)|C programming language]], as described in the book by Kernighan and Richie.<ref name="k&r1e">{{cite book | last=Kernighan | first=Brian W. | authorlink=Brian Kernighan | author2=Dennis M. Ritchie | title=The C Programming Language | edition=1st | publisher=[[Prentice Hall]] | date=February 1978 | ___location=[[Englewood Cliffs, NJ]] | isbn=0-13-110163-3 | authorlink2=Dennis M. Ritchie | url-access=registration | url=https://archive.org/details/cprogramminglang00kern }}</ref>
C has a concept called a statement. The language specification defines a statement as a chunk of syntax that is terminated by a ";". The language spec then says that "execution of the program proceeds one statement after the other, in sequence". Those words: "execution of the program proceeds one statement after the other, in sequence" are one piece of the execution model of C. Those words
The C language actually has an additional level to its execution model, which is the order of precedence. Order of precedence states the rules for the order of operations within a single statement. The order of precedence can be viewed as stating the constraints on performing the units of work that are within a single statement. So, ";" and "IF" and "WHILE" cover constraints on the order of statements, while order of precedence covers constraints on work within a statement. Hence, these parts of the C language specification are also part of the execution model of the C language.
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