How do `DO` loops work in Fortran 66?

Question

I\'m reading an old book I found in a second-hand book shop (again). This one is called \"Fortran techniques - with special reference to non-numerical applications\", by A.

Answer 1

The line number tells the code where to go when the loop is complete.

Yes, the numbers are odd, arbitrary, and meaningless. It's part of what made FORTRAN hard to read and understand.