160: Mainline

Either the if-true statement or the if-false statement or both may be embedded if statements. Accordingly, another solution to the ratio-testing problem looks like this:

#include  
main ( ) { 
  int ratio; 
  scanf ("%i", &ratio); 
  if (ratio < 10) 
     printf ("It is cheap!\n"); 
    else 
     if (ratio > 30) 
        printf ("It is expensive!\n"); 
} 

Note that the first if statement's if-false statement is, itself, an embedded if statement:

if (ratio > 30) 
   printf ("It is expensive!\n"); 

This second if statement is executed only if the ratio is not less than 10. If the ratio is between 10 and 30, nothing is displayed.