Is it possible to access a parameter of a function from another function in C?

Is it possible to access the value of a variable from a function within another function. You can assume that the first function is called in the main one.
Here is an example:

int foo (int x) {
    int z;
    // Do things...
    return 0;
}

int bar () {
    // Access value of z here.
    // Do more things...
    return 0;
}

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