babbage% gcc -o quarts-for-4 quarts-for-4.c && quarts-for-4 
Table of liter equivalents for gallons and quarts

                           Quarts
Gallons          0           1           2           3
   0           0.0000      0.9463      1.8927      2.8390
   1           3.7853      4.7317      5.6780      6.6243
   2           7.5707      8.5170      9.4633     10.4097
   3          11.3560     12.3023     13.2487     14.1950
   4          15.1413     16.0877     17.0340     17.9803
   5          18.9267     19.8730     20.8193     21.7657