Literals

Literal Constants

When a value is actually written in the program it is constant. Perhaps it would be more correct to such a value a 'Literal Constant'. In practice the term 'Literal' is used for short.

Literals are either numeric or character strings. We have already seen examples of both. In the following example:

put "Please enter your name:"

the text enclosed in those quotes is a literal and is constant. It never changes while the program is being run and it is the same every time the program is run.

Similarly if in a program you need to multiply a value by 3, then 3 is a constant because it will always be 3 in that part of the program.

x = y * 3

Literals in Expressions

Literals may be used anywhere in an expression. For example.

put "The number" 7 "is my lucky number"
put "The value of PI is" 3.14159265

will show:

The number 7 is my lucky number
The value of PI is 3.14159265

String Literals

put "The value of PI is" 3.14159265

In the above example the text “The value of PI is” is a string literal constant or string literal for short.

Numeric Literals

put "The value of PI is" 3.14159265

In the above example the value 3.14159265 is a numeric literal constant or numeric literal for short.


lynplexs/tutorial/literals.txt · Last modified: 2014/05/25 16:47 (external edit)