Vtech PreComputer Power Pad Plus User Manual - Page 41

Let B=10, Let B=15, Let C=a+b, Print First Number; A, Print Second Number; B, Print The Sum Is

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The computer creates a box in memory and calls it "A". It puts the number 8 in this box. Now type: 20 LET B=10 press ENTER The computer creates a box called "B" and places 10 into it. Type: 30 LET B=15 press ENTER Since there is a box called "B" already with a value of 10 in it, it doesn't make another box called "B" with a value of 15 in it. The number 10 is just replaced with the number 15. Now type: 40 LET C=A+B press ENTER This statement is a bit more complicated. Here's how it works. First, the computer searches for a memory box called "B" and finds the number 15. The "+" sign tells the computer to add the numbers found in "A" and "B" together. It computes this and the answer is 23. Now, where is the answer placed? The "=" tells the computer to store the answer in a memory box called "C". The computer searches for a box called "C". It doesn't find one so it creates one in memory and then puts the answer there. Of course, if there was a memory variable called "C" that had a number in it from a previous operation, the old number would be replaced by the new one in this statement. Now let's finish this by typing: 50 PRINT "FIRST NUMBER"; A press ENTER 60 PRINT "SECOND NUMBER"; B press ENTER 70 PRINT "THE SUM IS"; C press ENTER RUN 37

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37
The computer creates a box in memory and calls it “A”.
It puts the number 8 in this box.
Now type
:
20
LET B=10
press
ENTER
The computer creates a box called “B” and places 10 into it.
Type
:
30 LET B=15
press
ENTER
Since there is a box called “B” already with a value of 10 in it, it doesn’t make another
box called “B” with a value of 15 in it.
The number 10 is just replaced with the number
15.
Now type
:
40
LET C=A+B
press
ENTER
This statement is a bit more complicated.
Here’s how it works.
First, the computer searches
for a memory box called “B” and finds the number 15.
The “+” sign tells the computer
to add the numbers found in “A” and “B” together.
It computes this and the answer is
23.
Now, where is the answer placed?
The “=” tells the computer to store the answer
in a memory box called “C”.
The computer searches for a box called “C”.
It doesn’t find
one so it creates one in memory and then puts the answer there.
Of course, if there was a memory variable called “C” that had a number in it from a previous
operation, the old number would be replaced by the new one in this statement.
Now let’s finish this by typing
:
50
PRINT “FIRST NUMBER”; A
press
ENTER
60
PRINT “SECOND NUMBER”; B
press
ENTER
70
PRINT “THE SUM IS”; C
press
ENTER
RUN