Expression and Operator
Operator needs operand as value. And the expression is equivalent with value. So expressions can be located
Values can be generated in a variety of ways. The various methods mentioned here are expressions. Expressions in a programming language have a very important meaning.
Expression is combination of tokens(literal, identifier(variable name, function name, etc), operator, function call). The expression is evaluated to produce a single value. That is, an expression is a statement that can be evaluated as a single value.
Expression can be divided into a literal notation, an identifier expression, an operator expression, a function/method call expression, but they are all the same in that they are evaluated and made into a single value.
The value that generated by evaluation of an expression is equivalent with an expression. In other words, expressions can be used like values. This means that an expression can also be placed where the value can be placed.
