A program that will ask only 3 times for inputting the correct password.
The input/output in main.'Four user defined methods -add(), multiply(), arraymanipulation(), stringcases(). While or do-while should be used to repeat the process.
On the:

arraymanipulation() - input three integers then get the sum and average(2 Decimal only) using =

stringcases() - lower, upper, alternate

I urgently need your help... thanks a lot!

Why the "urgently needed" in the title?

Start coding those method in one class. In another put your main method and call those methods.
What this: "A program that will ask only 3 times for inputting the correct password." has to do with the rest of the requirements.

Start some coding and don't expect us to do all the work. First create those methods and then try to create only parts of the code, test them, and if they work add some more.

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