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By J.P. Lamoitier

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Example text

It does, however, make the program easier to write and follow. 12 includes a variable L, which takes on one of two values: 0 or 1. By assigning L a value of 0 at the beginning of the program, we will avoid printing the plus sign (+) in front of the first fraction that is found. Subsequently, the variable is set to 1, and the output of each following fraction is preceded with a plus sign. Comments on the program : The precision with which a number may be represented is fixed for any given computer.

Most of the words and symbols in all BASIC interpreters are the same, although there are exceptions. Various computer manufacturers may vary a particular instruction or symbol. Some BASIC interpreters may include features not available in other interpreters. For example, it is now becoming common practice for some BASIC interpreters to accept "true" integers: A %, B% . ) The % tells the BASIC interpreter to store and treat this variable as a computer integer (usually 16 bits), rather than a "floating point" number, which is encoded in 32 bits.

Note: The topic of round-off errors is discussed in detail in Chapter 6. 5 is produced by a program that displays output in a linearfashion . This method makes reading and understanding the output very inconvenient. To reduce the excessive length of the printout, we can display multiple solutions per line. For example, we can add an outputcontrol variable B that will cause the program to print three sets of numbers across the page, before advancing to the next line. 6. 8, respectively. Since ATARI BASIC lacks the usual TAB() command for cursor positioning, vertical alignment of output is accomplished by embedding the numbers (varying from one to three digits) in strings of fixed length.

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