From 《The C Programming Language》 Page 15

Add code: fahr-cels.c
    print Fahrenheit-Celsius table

      0  -17.8
     20   -6.7
     40    4.4
     60   15.6
     80   26.7
    100   37.8
    120   48.9
    140   60.0
    160   71.1
    180   82.2
    200   93.3
    220  104.4
    240  115.6
    260  126.7
    280  137.8
    300  148.9