Vtech PreComputer Power Pad Plus User Manual - Page 39
Let's Do Some Arithmetic
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LET'S DO SOME ARITHMETIC In the previous section you learned to program the sum of three numbers using the BASIC program. Numbers like 1, 3, 27, 14.3, etc., are called CONSTANTS, numbers that do not change value. The program added and subtracted the constants 12, 4 and 7. The order that you do addition is unimportant: 6+10 is the same as 10+6. In subtraction, the order is important: 10-6 is not the same as 6-10. So the order that you write numbers and do arithmetic operations is very important. In BASIC, operations are from left to right. The * symbol is used to represent multiplication. Like addition, the order of the numbers is unimportant. Here's an example. There are 2.204 pounds to a kilogram. How many pounds does a 6 kilogram parakeet weigh? Type this: 10 PRINT 6*2.204 RUN press ENTER The symbol / is used for division. Here, like in subtraction, the order of the numbers is important since 15/3 is 5 and 3/15 is .2. How many kilograms does a 6 pound parakeet weigh? Type this: 10 PRINT 6/2.204 RUN press ENTER You can also raise a number to a power. To do this you need the ^ sign. The expression 5^3 means 5*5*5 or 125; similarly, 3^5 means 3*3*3*3*3 or 243. There are fractional powers; for example 2^.5 is the square root of 2 or 1.414.... Here's an example: I bet you 1 dollar and throw the dice 10 times; each time you double your money. How much have you won? Type this: 10 PRINT 2^10 RUN press ENTER When you use all the operations together, it can get a bit complicated. After a winning baseball game, your 7 person team is awarded 3 cans of pop for the game plus another 11 cans because you finished first in the league. How many cans does each player get? 35