Presentation on theme: "Records Dasar Pemrograman. RECORDS Record data types—a complex type that combines different data types into a single record. Sometimes called set types."— Presentation transcript:
RECORDS Record data types—a complex type that combines different data types into a single record. Sometimes called set types. The individual elements of a record are called fields or components or component fields.
Each field has a name...the field identifier. The field identifiers provide a means of accessing each field in the record, similar to an array index. Each field has a type, which is established when the record is declared. The value of a record is a collection of values. There is a value in each field. RECORDS
The component of a record variable is a component variable.. field identifier...specifies a component variable. –e g: Business1.PresidentsLastName Though a record is a collection of values, it can sometimes be treated as a single value.
RECORDS So... –The record variable describes the raw record. –Record value indicates all the values in the record. –Component values indicate the field values. –Field identifiers name the fields in record.
Syntax type –Business = record –BusinessName: string; –StreetAddress: string –City: string; –State: string; –zip: integer; end;
A programmer may want to structure data with a hierarchy of records. e g: –student identification –birth date and age –core courses...etc...
Data Structures Records for a group may be read into an array. Thus, we see that... – data structures are a means of organizing, storing and manipulating data. How do we chose which structure to use? –Everything being equal, chose the one that can be understood and worked with most easily.
If all items are of the same type...a single array of that type works best. If items differ in type, use an array of records. Options…
with statements... With provides instruction(s) to carry out an operation. Syntax –with record_variable_list do statement (usually compound) The records_variable_list is separated by commas.
with statements... Instead of writing the syntax like this: Data.npm :=‘22297566’ Data.Nama:=‘Abdul Kadir’ Data.Fakultas:=‘Teknik’ We can replace using with expression: WITH Data Do Begin npm :=‘22297566’ Nama:=‘Abdul Kadir’ Fakultas:=‘Teknik’ end;
Example of record of array Type barang= RECORD nmbrg:string; jmlbrg:array[1..3]of byte; hrgbrg:real; total:real; end; var jual:barang; tbarang, i:integer; Begin clrscr; write(‘Nama Barang :’);readln(jual.nmbrg); for i:=1to 3 do begin write(‘Jumlah barang ’,I,’ : ’);readln(jual.jmlbrg[i]); tbarang:=tbarang+jual.jmlbrg[i]; end; write(‘Harga barang :’);readln(jual.hrgbrg); jual.total:=tbarang*jual.hrgbrg; writeln(‘Total Harga Barang = ‘, jual.total:10:2); end.
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