program9.txt

编译原理课程设计大作业PL0文法简易编译器

var oil,help:char;
      kg,total:real;
begin
    write('Enter the amount in kilograms(kg):');readln(kg);
    write('Enter type of the gasonline (a,b,c):');readln(oil);
    write('Enter type for service (f,m,e):');readln(help);

    case oil of
      'a':total:=1.50*kg;
      'b':total:=1.35*kg;
      'c':total:=1.18*kg;
      else writeln('Input Error !');
    end;

    case help of
      'f':;
      'm':total:=total*(1-0.05);
      'e':total:=total*(1-0.10);
      else writeln('Input Error !');
    end;

    writeln;
    writeln('Total is ',total:10:2);
end.