WAP to use for-loop in PL/SQL

WAP to use for-loop in PL/SQL
step-1

create table tb1(id number);
  
RUN THIS COMMAND, IF SUCCESSFULLY RUN THEN WRITE PL/SQL COMMAND
step-2

declare
vid number:=0;
begin
for vid in 1..10
loop
insert into tb1(id)
values(vid);

dbms_output.put_line(vid);
end loop;
end;

wap to display series 2,4,6,8,10 using "for loop"

/*wap to display series 2,4,6,8,10 using "for loop"*/

#include<stdio.h>
#include<conio.h>
void main()
{
int i,n=2,ser;
clrscr();
for(i=1;i<=5;i++)
{
ser=n*i;
printf("\n%d",ser);
getch();
}
}