Generally this means avoiding increment of + 255 ( unsigned 8-bit wraparound ), or avoiding overstepping the boundaries of [-128, + 127 ] ( signed 8-bit wraparound ) ( since there are no comparison operators, a program cannot distinguish between a signed and unsigned two's complement fixed-bit-size cell and negativeness of numbers is a matter of interpretation ).
22.
Comparison of programmer-defined data types ( data types for which the programming language has no in-built understanding ) may be carried out by custom-written or library functions ( such as strcmp mentioned above ), or, in some languages, by " overloading " a comparison operator that is, assigning a programmer-defined meaning that depends on the data types being compared.
23.
When implementing a three-way comparison where a three-way comparison operator or method is not already available, it is common to combine two comparisons, such as A = B and A < B, or A < B and A > B . In principle, a compiler might deduce that these two expressions could be replaced by only one comparison followed by multiple tests of the result, but mention of this optimisation is not to be found in texts on the subject.
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