By Eric Huggins (auth.)
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A computer is much less tolerant of mistakes in punctuation than is a human reader. If a comma or even a fultstop has been omitted from the text of this book, it will probably not worry you very much. The human eye is tolerant to such mistakes and often doesn't notice them. But such omissions cannot be tolerated in a computer program. Every punctuation mark in the above program is important, and the program would fail to work without it. So let us look at punctuation more closely. ines, I 8 and 14) are used to separate variables, expressions and other items when they are grouped together; for example, in a declaration or a READ or WRITE list.
Furthermore, as we shall shortly demonstrate, when real numbers are smaller than a certain (implementation-dependent) absolute value, the computer cannot distinguish them from zero. These limitations must be borne in mind for all calculations, including intermediate calculations. In addition to the possibility of causing an overflow with large numbers, as in integer arithmetic, there is also the possibility of problems with very small real numbers. If a number has become so small that it is held in the computer as zero, an error will occur if an attempt is made to use it as a divisor.
Just as a spoken or written language must be grammatically correct, so must a computer language be correctly constrocted. The term used in both cases for this constroction is syntax. There are generally two ways of learning correct syntax in a spoken or written language. One is by example and habit so that the correct syntax is used subconsciously. The other is by a study of the roles. When a child learns his native language or mother tongue, he uses the first method almost entirely, only later, perhaps, coming to a detailed study of the roles of syntax.