ABAYTHON

For any new programmer, who is keen to learn coding, the initial step would be to strengthen the thinking process. Logical thinking is a key to be a successful programmer. Syntax will only change in programming. So all programming languages will have if else, for loop, while loop, switch case, classes, objects, references, constructor etc. It is the person’s logical think tank which plays a crucial role in writing an efficient program.

Rule1: Never think about writing an efficient fast effective code.

Rule2: Have confidence on what you write. It can go wrong. But make sure that you take the lesson learned from writing that wrong code.

Rule3: Always hold the Rule 2 in mind.

Rule4: Say you have written some ten lines of code. First step would be to write a program without syntax error

Rule5: Strengthen your thinking with those 10 lines of code. Ask yourself  ‘what I wrote’ ‘How I started’ ‘How I ended’. Repeat this Rule 5 till you are  +∞ percentage sure about the logic. This is actually an exercise. This should stimulate your brain to think, provided you have the necessary interest. Now let’s strengthen the thinking with “Declaration, Assignment and Printing Data” using ABAP program.

Be it any field, Physics, Chemistry, Maths input should come out as output in the respective form. Look at the below figure.,

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Learn ABAP programming with these below steps.

1. First have sample data written in a rough sheet. Define those data with data types. For example ‘New Born’ is a name of string type. Similarly, figure out the data type of each data.
2. Declare meaningful variable names for the data with the data type in ABA editor.
3. Input the data which is assigning the data to the variables defined.
4. Process the data. For example, if age<40, then the generation type is young
5. Print out the data processed.

Below figure shows the direct way of doing it in ABAP

The same can be achieved through structures and internal table. Declaration, Assignment and printing out data is similar through structures and internal table. But the data variables are declared inside the structure. Data is assigned through structures. Each line of record through structures is stored in internal table. Then it is printed out by looping through the internal table. Below figures explains about structure and Internal table.

Example:

Variable declaration

TYPES: BEGIN OF st_corona,

Person_id TYPE int4,

Age TYPE int4,

Gender TYPE char01,

First_name TYPE string,

Last_name TYPE string,

Address TYPE string,

Postalcode TYPE c length 10,

Infection_rate_city TYPE decfloat34,

END OF st_corona.

DATA lt_corona_table TYPE TABLE OF st_corona.

DATA ls_corona_struct TYPE st_corona.

DATA:  r_desc TYPE REF TO cl_abap_structdescr,

Wa_comp TYPE abap_compdescr.

DATA l_string TYPE string.

DATA stru_string TYPE string.

FIELD-SYMBOLS <fs_field> TYPE any.

Data Assignment

Ls_corona_struct-person_id = ‚1000‘.

Ls_corona-_struct-age = 31.

Ls_corona_struct-gender = ‚M‘.

Ls_corona_struct-first_name = ‚New‘.

Ls_corona_struct-last_name = ‚Born‘.

Ls_corona_struct-address = ‚new no.12 streetnew 2nd street‘.

Ls_corona_struct-postalcode = ‚600021‘.

Ls_corona_struct-infection_rate_city = ‚0.8‘.

APPEND ls_corona_struct TO lt_corona_table.

Printing Data

R_descr ?= cl_abap_typedescr=>describe_by_data( ls_corona_struct ).

WRITE: / ‚Corona details‘.

LOOP AT lt_corona_table INTO ls_corona_struct.

        LOOP AT r_descr->components INTO wa_comp.

                 WRITE: / wa_comp-name.

            ASSIGN COMPONENT wa_comp-name OF STRUCTURE  ls_corona_struct TO <fs_field>.

                  l_string = <fs_field>.

            CONDENSE l_string.

            WRITE l_string.

       ENDLOOP.

ENDLOOP.

WRITE: / ‚End of corona details‘.