char barometer;
 char rainfall;
 
 printf ( "Please enter barometer reading" );
 scanf ( "%s", &barometer );
 
 printf ( "Did it rain yesterday?" );
 scanf ( "%s", &rainfall );
 
 if ( barometer == storm )  
 {
  printf ( "he wears overcoat and hat\n" );
 }
 if ( barometer == rain )
 {
  printf ( "he wears raincoat and takes an umbrella\n" );
 }
 if ( barometer == fair )
 {
  printf ( "he wears light over-jacket and takes an umbrella\n" );
 }
 if ( barometer == very dry)
 {
  printf ( "he wears light over-jacket\n" );
 }
 if (( barometer == change ) && ( rainfall == yes )) 
 {
  printf ( "%s\n", fair );
 }
 if (( barometer == change ) && ( rainfall == no ))
 {
  printf ( "%s\n", rain );
 } 
 exit(0);
}

char rainfall[2]; // 1 byte for either Y or N and secnd byte for null terminator
scanf ( "%s", &rainfall );

// assuming storm is low, and better weather is higher
if(barometer <= storm)
// ...
else if(barometer <= rain)
// ...
else if(barometer <= fair)
/* etc... */