How does an in-line subroutine differ from a macro? Under what circumstances is it desirable to expand a subroutine in-line? What is the difference between formal and actual parameters? Describe four...

How does an in-line subroutine differ from a macro? Under what circumstances is it desirable to expand a subroutine in-line? What is the difference between formal and actual parameters? Describe four common parameter-passing modes. How does a programmer choose which one to use when? Explain the rationale for READONLY parameters in Modula-3.