Respuesta :
The expression that attempts to read an integer from standard input and store it in an int variable, x, that has already been declared. is cin >> x;
C is a "strongly typed" programming language. A variable acquires a type. Once the type of a variable has been stated, it can only hold values of that type. For example, an int variable can only retain integers like 123 and NOT floating-point numbers like -2.17 or text strings like "Hello." To facilitate the understanding of data made primarily of 0s and 1s, the idea of type was incorporated into early programming languages. Understanding the kind of data substantially facilitates its interpretation and processing. Each variable can be stated only once.
Variables in C can be defined at any place in the program as long that they are declared before they are utilized. (In C previous to C99, all parameters were equal.)
Learn more about C++ Expression here:https://brainly.com/question/14852095
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