Using the abs () function requires including the ____ header file. a. cnumber b. iostream c. math d. cmath The squareroot function a. is provided in the library header. b. returns the square of the argument c. returns the square of the function d. the argument type is int A void function a. performs some action and return a value b. performs some action but does not return a value c. is always used in a statement. d. is not a function. To execute multiple statements when an if statement's condition is true, enclose those statements in a pair of; a. Parentheses, (). b. Square Brackets, []. c. Braces, {}. d. Angle brackets, . How many times will the following loop print hello? i = 1; while (i