C has no special
type to represent logical or boolean values. It improvises by using any of
the integral types char, int, short, long, unsigned, with a value of 0
representing false and any other value representing true. It is rare for
logical values to be stored in variables. They are usually generated as
required by comparing two numeric values. This is where the comparison
operators are used, to compare two numeric values and produce a logical
result. |
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Note that == is
used in comparisons and = is used in assignments. Comparison operators are
used in expressions like the ones below. |
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In the last
example, all arithmetic is done before any comparison is made. |
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These
comparisons are usually used to control an if statement or a for or a while
loop. These will be introduced in a later chapter. |
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