RECORDS ASSIGNMENT

▶ RECORDS ASSIGNMENT

Assign Record by Function

Consider this code:

go:

gonebook { }

gonebook book

print gonebook

book: { ISBN '' title '' }

{
ISBN: ''
title: ''
}

book is a parameterless function that returns a record, and in the assignment line gonebook book, gonebook is assigned a book record by book function.

To assign a record with data, we modify book function:

go:

gonebook {}

gonebook book '978-3-16-148410-0' 'Gone With The Wind'

print gonebook

book isbn title:

result {}

result <- 'ISBN' isbn

result <- 'title' title

result

{
ISBN: '978-3-16-148410-0'
title: 'Gone With The Wind'
}

And a Library example:

library { name 'Puerto Natales Library'}

books

library <- 'books' books

go:

addbook '978-3-16-148410-0' 'Gone With The Wind'

addbook '978-3-16-148410-1' 'Gone With Style'

print library

addbook isbn title:

newbook {}

newbook <- 'ISBN' isbn

newbook <- 'title' title

library.books <- newbook

{
name: 'Puerto Natales Library'
books: [ {
ISBN: '978-3-16-148410-0'
title: 'Gone With The Wind'
}, {
ISBN: '978-3-16-148410-1'
title: 'Gone With Style'
} ]
}

In the last chapter there was a fix duration example. Now let's print the real number of seconds that passed between two calls to now system function:

starttime endtime { totalsecond 0 }

starttime now

pause 1

endtime now

print startspan starttime.totalsecond

print endspan endtime.totalsecond

print endspan - startspan

127613.2075469
127614.2215487
1.01400180000928

In line 'starttime endtime { totalsecond 0 }', we declared two record variables and assigned them a totalsecond property, thus enabling the static access as done in line print startspan starttime.totalsecond.
The line starttime now assigns starttime by the mapping data of now system function. Upon assignment, totalsecond property is updated.
Measurement of program execution duration can be done by using this type of code.

PART 6

PART 8