Diesel engine specifications include its weight ( w ), maximum horsepower ( hp ), and maximum torque ( t ). The performance of such engines can be compared using a performance index. In one study the performance index ( pi ) is defined as the ratio of maximum horsepower per unit of weight (i. e. pi = hp / w ) of engine. Write a program to calculate the performance index of several engines based on the following guidelines.

Define a class (called engine ) containing the specifications of a typical engine (i. e. w , hp , and t ) and member function(s) to read these specifications.

Write a program to make use of an object of class engine type to calculate the performance index of six different engines listed below and print the index and the specifications of each engine to an output file having a format exactly like that shown below
Maxium(hp): 68, 72, 168, 725, 220, 130

Maximm torque(Ib-ft): 225, 281, 664, 2840, 560, 393

Weight(Ib): 4750, 5012, 7240, 9680, 7540, 6180

Performance Index(hp/Ib): 0.01431,

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