write a C/C++ program that defines a function Lucas() that calculates the n th number in a Lucas number sequence, where the user enters n into the program interactively
The first few numbers in the series of Lucas numbers are: {1; 3; 4; 7; 11; 18; ... ; LN} The Lucas-numbers are determined by: (?1 = 1, ?2 = 3, ??+2 = ??+1 + ?? ) That is, a Lucas number is calculated as the sum of its two immediate previous terms in the Lucas series. Using this information, write a C/C++ program that defines a function Lucas() that calculates the n th number in a Lucas number sequence, where the user enters n into the program interactively. For example, if n=6, the program should display the value 18. The function accepts one integer parameter for the value of n and returns the result to the calling statement in main(). See the example output in Figure 2.2.
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