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Depending on the programming language you choose to work with, there will be different varieties of input validation errors (meaning, some input will fail to validate for a diverse amount of reasons). Some common ones are presented here. Note that they are generically named; there is no standard for the following types of errors.
Data Type errors occur when the data is not the correct type of data. For example, an integer may be required when a string is given, thus causing an error.
Length errors occur when the data is too shorter or longer than required.
Invalid Range errors occur when numeric data does not fall within a permitted range. For example, if the range was 0 to 3, 2 would pass validation while -1 or 4 would not.
Invalid Character errors occur when the data is a string (or similar) which contains a character that is not permitted. For example, if all "a" characters are forbidden, "alex" would not validate while "timmy" would.
Other Types of Errors may occur depending on your programming language. When programming for input validation, ask yourself what could possibly go wrong. What could the user enter which would ruin your program (or be an annoyance)? Make sure the user cannot enter that data.
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Do you need any input signal to have oscillation in oscillator circuits?
in general no. however some types of oscillators have enable or frequency selectinputs, without which they won't operate.
