Assignment A statement that assigns a value to a variable. concatenate To join two operands end to end. comment Information in a program that is meant for other programmers (or anyone reading the source code) and has no effect on the execution of the program. evaluate To simplify an expression by performing the operations in order to yield a single value. expression A combination of variables, operators, and values that represents a single result value. floating point A type that represents numbers with fractional parts. integer A type that represents whole numbers. keyword A reserved word that is used by the compiler to parse a program; you cannot use keywords like if, def, and while as variable names. mnemonic A memory aid. We often give variables mnemonic names to help us remember what is stored in the variable. modulus operator An operator, denoted with a percent sign (%), that works on integers and yields the remainder when one number is divided by another. operand One of the values on which an operator operates. operator A special symbol that represents a simple computation like addition, multiplication, or string concatenation. rules of precedence The set of rules governing the order in which expressions involving multiple operators and operands are evaluated. statement A section of code that represents a command or action. So far, the statements we have seen are assignments and print expression statement