Valueandvariables
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This document discusses procedures in Pascal and how variable parameters can be used to pass information into and out of procedures. It provides examples of procedures called Vehicle and Vehicle2 that calculate speed from time and distance. Vehicle uses variable parameters to pass time and distance into the procedure, while Vehicle2 uses value parameters, only allowing the values to be passed into the procedure. The examples call these procedures with different values to demonstrate how variable and value parameters work.
Valueandvariables
- 1. Answer
- 3. Speed*Distance Answer
- 5. A+B=C Answer
- 6. A+B=C
- 7. Weight = 3024 g Answer
- 8. Weight = 3024 g
- 9. Time = T + D Answer
- 10. Time = T + D
- 11. S*D = (5*5.2) Answer
- 12. S*D = (5*5.2)
- 13. Value Parameters can be used to supply information to a procedure, but not out from it.
- 14. Procedure Vehicle (var Time, Distance: real); Var speed:real; Begin speed := Time*Distance; writeln(‘The speed is:’, Speed:6:2); End;
- 15. The Variable Parameters can be used to bring information into the procedure and/or pass information from out of the procedure.
- 16. Procedure Vehicle2 (Time, Distance: real); Var speed:real; Begin speed := Time*Distance; writeln(‘The speed is:’, Speed:6:2); End; Begin Clrscr; Vehicle2(5,5.5); Readln; End.
- 17. Program Subprograms; Begin Uses crt; Clrscr; Var T, D : real; T:=5; Procedure Vehicle (var Time, Distance: D:=5.5; real); Vehicle (T,D); Var Speed: real; Vehicle2 (5,5.5); Begin Vehicle2 (T+5,5.5*2); Speed := Time*Distance; Vehicle2(T,D); writeln (‘the speed is:’ , speed:6:2); Readln; End; End. Procedure Vehicle2 (Time, Distance: real); Var Speed: real; Begin Speed := Time*Distance; writeln (‘the speed is:’ , speed:6:2); End;