You can find some code with the classic 5+1 spaces at the left, line numbers, no more than 72 characters. My recommendation is that if you are going to add new code, write nice code with proper nesting and using the "intersection" formatting

On the other hand, the compilers are very good. Sometimes they are faster than C because you are not expected to do too much silly things with pointers, so the compiler can understand the code better. In The Computer Language Benchmarks Game, you can see that many times Fortran is faster than C.