Arithmetic with Variables

Look at the following program. Remember the idea of sequential execution: Unless directed otherwise, a QBasic program runs by starting with the first statement and executing the statements in sequence.

' Arithmetic with Variables
'
LET AGE = 23
PRINT "You have lived more than", AGE * 365, " days"
END

The first statement, LET AGE = 23 does two things:

• Memory is reserved for the variable AGE
• The value 23 is stored in the variable

So after this statement has executed a section of memory named AGE holds 23:

The first time a particular variable is used in a program, a section of main memory will be reserved for it.