a variable that determines whether or not a loop will continue is a
For loop A for-loop has two parts: a header specifying the iteration, and a body which is executed once per iteration. The header often declares an explicit loop counter or loop variable, which allows the body to know which iteration is being executed. For-loops are typically used when the number of iterations is known before entering the loop. For-loops can be thought of as shorthands for while-loops which increment and test a loop variable.
Material conditional The circle on the left bounds all members of set   A  {\displaystyle A} , and the one on the right bounds all members of set   B  {\displaystyle B} . The red area describes all members for which the material conditional is true, and the white area describes all members for which it is false. The material conditional differs significantly from a natural language's "if...then..." statement. It is only false when both the antecedent   A  {\displaystyle A}  is true and the consequent   B  {\displaystyle B}  is false.]]