Tyl String

▶ STRINGS

String is a collection of characters.

Consider this program:


            main »

             name 'Eitan'

             print name

Eitan

Tyl identifies a value as string, only if it is enclosed in (single) quotaion marks (').
First we assign the string value: 'Eitan', to the name string variable. As mentioned earlier, name variable gets its type upon assignment.

We can print a string directly:


            main »

             print 'Eitan'

Eitan

What if we wanted to print: name: 'Eitan'?

We could't write ''Eitan'', because the internal quotations will not be interpreted as quotation marks for printing.

So we use the backward quotation mark (`):


            main »

             print 'name: `Eitan`'

name: 'Eitan'

The backward quotation mark (`) inside a quoted string, will cause the system to print quotation mark.

Strings can be added by the '+' operator:


            main »

             full_name 'Eitan' + '  ' + 'Livne'

             print full_name

Eitan Livne

Other options of adding variables and string literals:


            main »

             name 'Eitan'

             family_name 'Livne'

             full_name1 name + '  ' + 'Livne'

             full_name2 name + '  ' + family_name

             print full_name1

             print full_name2

             print name + '  ' + family_name

Eitan Livne
Eitan Livne
Eitan Livne

Assigning a variable to a new variable:


            main »

             my_city 'Pucon'

             your_city my_city

             print my_city + ',  ' + your_city

             print 'Now you are leaving my city...'

             your_city 'Chillan'

             print my_city + ',  ' + your_city

Pucon, Pucon
Now you are leaving my city...
Pucon, Chillan

In line: 'your_city my_city', your_city variable gets the value of my_city variable, so their value is the same.
Then, your_city variable is assigned another value. Each time, the values of my_city and your_city are printed.