Exercise 5 Write a method to convert an upper-case letter to a lower-case letter. (Hint: Check first to be sure that it is not lower case already.)

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Extracted text: Exercise 5 Write a method to convert an upper-case letter to a lower-case letter. (Hint: Check first to be sure that it is not lower case already.)


Extracted text: Exercise 1 Create a method that takes a value and indicate whether it is positive or negative by a return a Boolean value. Declared as: boolean isPositive (float a) Exercise 2 Create a method that takes a value and tell whether it is null or not. Declared as: boolean isZero (float a) Exercise 3 Create a method delta() that takes three values, a, b and e, which are the coefficients of a quadratic equation and returns the value of the delta, which is given by b ² - 4ac Exercise 4 Using the 3 methods above, create an application that calculates the roots of an equation of second degree: ах * + bx +с %3D0 For it exists, the coefficient a must be nonzero. If delta is positive, then there are two distinct roots: -6+ VA -6 - VĀ and 2а 2а If delta is zero, then there is exactly one real root: 2a' If delta is negative, there is no real solution.