ifelif allows us to take one action for multiple decision entries.
#define USA 1
#define EUP 1
#include
#if (defined (USA))
#define currency_rate 46
#elif (defined (EUP))
#define currency_rate 100
#else
#define currency_rate 1
#endif
main()
{
int rs;
rs = 10 * currency_rate;
printf ("%d\n", rs);
}
460