C Tutorial/Preprocessor/ifelse
ifelse
Use ifelse to define an action if the condition is not true.
#define USA 1
#define EUP 1
#include <stdio.h>
#if (defined (USA))
#define currency_rate 46
#else
#define currency_rate 100
#endif
main()
{
int rs;
rs = 10 * currency_rate;
printf ("%d\n", rs);
}460
