1 REM THIS PROGRAM APPEARS AT PAGE 42 OF THE ITALIAN VERSION OF
2 REM "PROGRAMMING IN BASIC" 1ST EDITION, BY BYRON S. GOTTFRIED 
5 REM PROGRAM TO CALCULATE AREA AND CIRCUMFERENCE OF A CIRCLE
10 LET P=3.1415927
20 PRINT "RADIUS=";
30 INPUT R
35 IF R=0 THEN 80
40 LET A=P*R^2
50 LET C=2*P*R
60 PRINT "R=";R,"A=";A,"C=";C
65 PRINT
70 GO TO 20
80 END
