HP71B: lets come to speed

[Albert Chan]

Question 1, Except for arguments of function, variables are global.
This is similar to Awk programming language

Example, for perimeter of ellipse AGM code, updated with all local variables.
(Awk style, with spaces separating arguments from local variables)

Code:

10 DEF FNP(A,B) = FNQ(A,B,A*A+B*B,1,0)
20 DEF FNQ(A,B,   S,T,K)
30 REPEAT @ K=(A-B)/2 @ B=SQRT(A*B) @ A=A-K @ T=T+T @ K=T*K*K @ S=S-K @ UNTIL S=S+K
40 FNQ = S/B*PI @ END DEF

>RUN
>FNP(20,10)
96.8844822058
>FNP(20,5)
85.7842177517
>FNP(20,1)
80.3885123826