Logical operators don't Compare values they combine Boolean values and produce a Boolean result. Examples of logical operators are && (and), , (or), ! (not). If you have two Boolean values and you combined them with the && operator the result will be (TRUE) only if both values were (TRUE).
Relational operators compare two values and produce a Boolean result. Most of the time we use logical operators to combine the results of two or more comparison expressions that use relational operators.
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Assuming that you mean the difference between system software (the term used by Microsoft, Sony and Nintendo to refer to the operating systems used by the Xbox 360, PlayStation 3 and Wii respectively) and operating system, the difference is very minor. If you mean the difference between system software and an operating system in the PC world, the term system software usually applies to things like the Device Manager in Windows or the Logical Disk Manager; software that comes pre-installed with the operating designed to interact with hardware on a fundamental level. The term "operating software" when not used synonymously with "operating system" is usually used interchangeably with the term "system software" in the PC world, but it can also refer to software used to completely managed an external system.
One needs to use logical thinking in all subjects.
Lady Macbeth was the more driven, single-minded, and logical of the couple.
airthmetic, logical and storage operations
Determining your main points