Consider the RationalNumber class declaration below. You need to write four functions: - A stand alone friend function that overloads the << operator and prints a rational number in the form numerator/denominator. - A member function that overloads the subtraction operator (-) for the RationalNumber class. The member function subtracts two RationalNumber objects r1 and r2 and assigns the result to object r3. - A standalone friend function that overloads the postfix increment operator ( ) for the RationalNumber class. The friend function adds one to a RationalNumber object and allows cascaded function calls. - A stand alone friend function that overloads the >> stream extraction operator and prompts the user for rational number (numerator and denominator)

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How often does colleges update the cost of attendance on their website? . a)every two years b) every four years c) every year d) every semester

The idea that, for each pair of devices v and w, there’s a strict dichotomy between being “in range” or “out of range” is a simplified abstraction. more accurately, there’s a power decay function f (·) that specifies, for a pair of devices at distance δ, the signal strength f(δ) that they’ll be able to achieve on their wireless connection. (we’ll assume that f (δ) decreases with increasing δ.) we might want to build this into our notion of back-up sets as follows: among the k devices in the back-up set of v, there should be at least one that can be reached with very high signal strength, at least one other that can be reached with moderately high signal strength, and so forth. more concretely, we have values p1 ≥ p2 ≥ . . ≥ pk, so that if the back-up set for v consists of devices at distances d1≤d2≤≤dk, thenweshouldhavef(dj)≥pj foreachj. give an algorithm that determines whether it is possible to choose a back-up set for each device subject to this more detailed condition, still requiring that no device should appear in the back-up set of more than b other devices. again, the algorithm should output the back-up sets themselves, provided they can be found.\