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program HelloWorld;
var 
x,y,z,S:real; 
begin
   writeln('Введите три дробных числа');
   readln(x,y,z);
   x:=Frac(x);
   y:=Frac(y);
   z:=Frac(z);
   S:=(x+y+z)/3;
   writeln('Ср арефмитическое=',S);
end.
 

Main.java:1: error: class, interface, or enum expected
program HelloWorld;
^
Main.java:2: error: class, interface, or enum expected
var 
^
Main.java:4: error: class, interface, or enum expected
begin
^
Main.java:5: error: unclosed character literal
   writeln('??????? ??? ??????? ?????');
           ^
Main.java:5: error: unclosed character literal
   writeln('??????? ??? ??????? ?????');
                                     ^
Main.java:6: error: class, interface, or enum expected
   readln(x,y,z);
   ^
Main.java:7: error: class, interface, or enum expected
   x:=Frac(x);
   ^
Main.java:8: error: class, interface, or enum expected
   y:=Frac(y);
   ^
Main.java:9: error: class, interface, or enum expected
   z:=Frac(z);
   ^
Main.java:10: error: class, interface, or enum expected
   S:=(x+y+z)/3;
   ^
Main.java:11: error: class, interface, or enum expected
   writeln('?? ??????????????=',S);
   ^
Main.java:11: error: unclosed character literal
   writeln('?? ??????????????=',S);
           ^
Main.java:11: error: unclosed character literal
   writeln('?? ??????????????=',S);
                              ^
Main.java:12: error: class, interface, or enum expected
end.
^
14 errors

Standard output is empty