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40
50 PRINT “THE ANSWER IS”; N press ENTER
RUN
The statement at line 10 stores the numeric constant zero into N, a numeric variable. In
statement 20 the variable will have a numeric constant,1, added to itself and then the sum
of that operation will be stored in place of the value previously stored there.
The program in the above example contains a programming construction called a loop.
A loop is one or more BASIC statements, usually called a set, that can be executed as
many times as you want. The statement in line 40 contains an IF statement. It is called
a conditional statement and will be discussed in detail under the topic called Making
Decisions.
INPUTTING DATA
We have been putting information into the computer by typing constants into programs using
statements like the following:
10 LET N=10 press ENTER
20 LET A$=“NANCY LIKES CHOCOLATE CUPCAKES”
Another way to supply data is by using an INPUT statement.
Try this out by typing:
NEW
10 INPUT “GIVE ME A NUMBER”; N press ENTER
20 PRINT “YOUR NUMBER IS”; N press ENTER
RUN
The unit will prompt you to input a number with the character. Type any number of digits
that you like and press ENTER.
You can also input alphabetic data into string variables like this program:
10 INPUT “WHAT IS YOUR NAME”; N$ press ENTER
20 PRINT “HI THERE”; N$