Completed Program

This program could have been done without using an array. But by using an array, the data is more organized. The data (the inches of rain each day) are not three unrelated numbers, but they belong to a collection. It is nice to give the collection a name ("RAIN") and to use a subscript to get individual items from it. In long programs, or in programs that deal with large data sets, such organization is the only way to keep things straight.

DIM RAIN(1 TO 3)                '  The array will store the rainfall
'
' Collect data from the user
PRINT "Enter rainfall for day 1:"
INPUT RAIN(1)

PRINT "Enter rainfall for day 2:"
INPUT RAIN(2)

PRINT "Enter rainfall for day 3:"
INPUT RAIN(3)

LET SUM = RAIN(1) + RAIN(2) + RAIN(3)      '  Add up the rainfall for all three days
LET AVG = SUM / 3

PRINT "The average rainfall was:", AVG, " inches"
END

Here is a sample run of the program:

Enter rainfall for day 1:
? 1
Enter rainfall for day 2:
? 2
Enter rainfall for day 3:
? 3
The average rainfall was:    2             inches