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Use of Functions in C for a Teller Machine

I am new at this programming stuff, and functions are confusing to me. I think what I do is replace some of the text from tutorial 5 with functions, but not quite grasping what to do. I have, and will, continue to read more about these to further try to understand this. I practiced some more with what I learned in tutorial 5, and I think I am understanding that, but functions are confusing me. They seem efficient in use and would make the program easier to write, but I am lost right now. What I am trying to accomplish with this tutorial is the same as tutorial 5, but structuring it different by using functions. I will attach what I have so far, some instructions in what I am trying to do, and what the tutorial 5 looks like without functions.
Please put in the form of what is seen in a compiler as it helps me learn better. The instructions say I shouldn't have to modify it too much. The program should run just like tutorial 5; with the user entering a current balance, entering the number of deposits and withdrawals, and then the bank record printing out. Basically, transforming the same output into functions. I will continue to work on it as well.

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Functions are self-contained blocks of code that performs one task efficiently. The solution includes dividing the whole problem into a number of functions that help accomplish the overall task, in this case, an Teller Machine. ...

Solution Summary

This solution is instructive in understanding how to convert a flat C program into a function based modular program.

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