//file1.h #define USD 1 //file2.h #define UKP 1 //file3 #include <stdio.h> #include <file1.h> //A #if (defined (USD)) // B #define currency_rate 46 #else #define currency_rate 100 //C #endif //D main() { int rs; rs = 10 * currency_rate; //H printf (“%d\\n”, rs); }