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Here 21 would be multiplied by 7 for the result of 147. COMBINING THINGS Even though we've spent a lot of time in areas that might not seem very important, the details presented here will make more sense once you start to program, and will prove invaluable. To give you an idea how things flt in place, consider the following: how could you combine the two types of print statements we've examined so far to print something more meaningful on the screen? We know that by enclosing something within quote marks prints that information on the screen exactly as it was entered, and by using math operators, calculations can be performed.

9 If you took the time to add this up by hand, you would get a different result. What's going on here? Even though the computer has a lot of power, there's a limit to the numbers it can handle. The Commodore 64 can work with numbers containing 10 digits. However when a number is printed, only nine digits are displayed. So in our example, the result was "rounded" to fit in the proper range. The Commodore 64 rounds up when the next digit is five or more; it rounds down when the next digit is four or less.

Type: MULTIPLICATION If you wanted to multiply 12 times 12, use the asterisk (*) to represent multiplication. You would type: DIVISION Division uses the familiar "I". For example, to divide 144 by 12, type: 24 EXPONENTIATION In a like fashion, you can easily raise a number to a power (this is the same as multiplying a number by itself a specified number of times). The 'j' (Up arrow) signifies exponentiation. PRINT 2488:32 12 t This is the same PRINT 5 as typing: 12 .. 12 .. 12 .. 12 .. 12 248:3:32 TIP: BASIC has a number of shortcut ways of doing things.

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C64 Users Guide

by Daniel

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