OPOSSUMS ARE MARSUPIALS. If you open just about any field guide to North American mammals, the opossum will probably be the very first of the 380 or so mammal species described. That's because opossums are our only marsupial, and marsupials are considered very ancient forms of mammals.
operator - an agent that operates some apparatus or machine; the operator of the switchboard. manipulator. causal agency, causal agent, cause - any entity that produces an effect or is responsible for events or results. company operator - an operator who works for a company. driver - the operator of a motor vehicle.
Operators are used to connect operands, i. e., constants and variables, to form expressions. For example, in the expression a+s, a and s are operands and + is the operator. Depending on the number of operands on which an operator operates, the operators in C language can be grouped into three categories: unary operators, binary operators and ternary operators. A unary operator takes only one operand, as in -x, whereas a binary operator operates on two operands, as in a+b.