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#C++11, 33 bytes

Function that assigns to its parameter:

int f(decltype('B')*c){*c='C'-2;}

Also allows lowercase:

int f(decltype('B')*c){*c='c'-2;}

Usage:

#include <iostream>
main(){
 char c;
 f(&c);
 std::cout << c << std::endl;
}

Pretty hard to do it otherwise since no #include, return or auto because of U. Modifying parameters for return values seems ok Meta