http://kor.i2p/books/The%20C%20Programming%20Language%20by%20K&R/chapter1.html
For instance, we might say printf("%3d %6d\n", fahr, celsius); to print the first number of each line in a field three digits wide, and the
second in a field six digits wide, like this: 0 -17
20 -6
40 4
60 15
80 26
100 37
... The more serious problem is that because we have used integer arithmetic, the
Celsius temperatures are not very accurate; for instance, 0 o F is
actually about -17.8 o C, not -17.