Not able to print the value of the variable

I wrote the code below

create or REPLACE PROCEDURE ARMSTRONG_NUMBER_a
as


arm_num number :=371;
num_len number:=0;
a number:=0;
b number:=0;
c number;
BEGIN
num_len := length(arm_num);
for i in 1..num_len
loop
DBMS_OUTPUT.put_line('VALUE of i ' || i );
b:= substr(a,i,1) ;
DBMS_OUTPUT.put_line('VALUE OF b ' || b );
end loop;
end;

Hello

Rahul_India wrote:

I wrote the code below

  1. create or REPLACE PROCEDURE ARMSTRONG_NUMBER_a
  2. as
  3. number of arm_num: = 371;
  4. num_len number: = 0;
  5. a number: = 0;
  6. b number: = 0;
  7. c number;
  8. BEGIN
  9. num_len: = length (arm_num);
  10. because me in 1.num_len
  11. loop
  12. Dbms_output.put_line ('VALUE of i' | I);
  13. b: = substr (a, i, 1);
  14. Dbms_output.put_line ('VALUE OF b' | b);
  15. end loop;
  16. end;
  1. O/P
  2. anonymous block filled
  3. VALUE of i 1
  4. VALUE OF b 0
  5. I VALUE 2
  6. VALUE OF b
  7. I VALUE 3
  8. VALUE OF b

I should get the O/P as

anonymous block filled

VALUE of i 1

VALUE OF b 3

I VALUE 2

VALUE OF b 7

I VALUE 3

VALUE OF b 1

This is the output that I would expect if line 15 has

b: = substr (arm , i, 1);

but not when you take the character of the i - th one.

Moreover, if one (or arm) and b are numbers, then you can consider using number functions, like TRUNC and MOD, might be a better way to get individual numbers - assuming that you really need to get the individual numbers.  It is often a symptom of a bad design, where the number is actually a composite of what must be in multiple separate columns.

SUBSTR expects its first argument to be a string.  If you really must call SUBSTR, then its better to ouse TO_CHAR to explicitly convert the number of strings.

Tags: Database

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