139: Mainline

The following program uses a macro symbol, MINIMUM_RETURN_RATE, as well as global variables, deposit_rate and marginal_rate:

#include  
/* Define MINIMUM_RETURN_RATE to be a macro */ 
#define MINIMUM_RETURN_RATE 2.5 
/* Define deposit_rate and marginal_rate to be global variables */ 
double deposit_rate, marginal_rate; 
void display_analysis ( ) { 
  double net_rate; 
  net_rate = deposit_rate - deposit_rate * marginal_rate / 100.0; 
  printf ("The net rate for your deposit is %f percent.\n", net_rate); 
  printf ("The deviation from the acceptable rate is %f percent.\n", 
           net_rate - MINIMUM_RETURN_RATE); 
} 
/* Then, define main */ 
main ( ) { 
  scanf ("%lf%lf", &deposit_rate, &marginal_rate); 
  display_analysis ( ); 
} 
--- Data ---
7.1 42.5 
--- Result --- 
The net rate for your deposit is 4.082500 percent. 
The deviation from the acceptable rate is 1.582500 percent.