Write a function bool ok(int q[], int c) for the "eight numbers in a cross" problem. ok returns true if the configuration in q[0] through q[c] is fine according to the rules discussed in class. note that the array int a[8][5] should be local to the function (and static) since that is the only place that it is used.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]