Addition of Two Numbers

 Addition of Two Numbers
  declare
  a number;
  b number;
  c number;
  begin
  a:= &a;
  b:= &b;
  c:= a+b;
  dbms_output.put_line('Sum of '|| a ||' and  ' || b ||' is ' || c);
 10* end;

SQL> /
Enter value for a: 20
old   a:= &a;
new   a:= 20;
Enter value for b: 30
old   b:= &b;
new   b:= 30;


Sum of 20 and 30 is 50