Compare two rationals. @param a first rational @param b second rational @return 0 if a==b, 1 if a>b, -1 if a<b, and INT_MIN if one of the values is of the form 0/0
See Implementation
Compare two rationals. @param a first rational @param b second rational @return 0 if a==b, 1 if a>b, -1 if a<b, and INT_MIN if one of the values is of the form 0/0