Functions w/ only 1 vbl(ptr) to a Structure ...HELP!

Need help to write a function that obtains input from user for a student's information and the function's only argument should be a pointer to a structure of the user defined type.

Actual code examples will help as well as referring tutorials or help sites.

Anything will help
THX.
C

You mean something like this:

Code:

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// this is a small sample but you get the idea
struct student {
    std::string last, first, middle;
    float gpa, class1, class2;
}

void calc_gpa(student *s) {
    s->gpa = (s->class1+s->class2)/2;
}

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