Question: we used the functions printf and scanf, which, as I understand it , are defined in C source code. My question is , how are

we used the functions printf and scanf, which, as I understand it, are defined in C source code. My question is, how are these functions searched for and found? Does this mean we can only define external functions with a given name once, or else we would not be able to figure out which function we want to branch to?

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