steenrod% g++ -c rational3.cc
steenrod% g++ -o rat-driver-3 rat-driver-3.cc rational3.o
steenrod% rat-driver-3
The following rational numbers have been defined
  z             i(4)         r(3, 5)
0 / 1          4 / 1          3 / 5
The corresponding decimal values are:
0.00000       4.00000        0.60000
Enter two fractions (a and b):  2 / 4   3 / 5
Two additional rational numbers are:
Your a        Your b        s = a + b
1 / 2          3 / 5         11 / 10