Definition of dray. : a vehicle used to haul goods; especially : a strong cart or wagon without sides.
Expressions versus Equations. A difference between expressions and equations is what each represents. An expression shows a math relationship. One key to an expression is that there is no solution. An expression does not have an answer. An expression, however, can be evaluated. To evaluate an expression, substitute values for the variables.
Expressions and Operators. An expression is a statement that can convey a value. Some of the most common expressions are mathematical, such as in the following source code example: int x = 3; int y = x; int z = x * y; All three of these statements can be considered expressionsâthey convey values that can be assigned to variables.