Non linear programming example c, java?

Do you know a good example of nonlinear programming?, I have search over google, but any text just formulate and开发者_Python百科 do not solve the problem, They mention lingo and even excel for solving it.

Could you please post an example and explain a little of if?

Thanks in advance

P.d You know the idea is to see some results, and numbers, using C, java. Thanks

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try these (java):

Example1

Example2

Example3