Actually, my copy of the second edition K&R seems to have the opening brackets on new lines when it comes to function declarations, so:

main () {

but: while (){ and: if(){

I don't have a copy of the first edition at hand but I seem to remember that it uses this same style.

//msl

The first edition has opening brackets for functions on a new line. It also used a space before parenthesis for while loops and conditionals. Return types, when required, were on the same line as a function name.

Exactly. On a 24-line VT100 display, you bet that every line was important!