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DomainError

DomainError()

The arguments to a function or constructor are outside the valid domain.

Examples

In the Julia programming language, the function DomainError() is used to indicate an error when the arguments provided to a function or constructor are outside the valid domain.

julia> DomainError(10, "Invalid argument")
ERROR: DomainError with 10:
Invalid argument

This example raises a DomainError with the value 10 and the error message "Invalid argument". The DomainError function is typically used in conjunction with conditional statements or exception handling to handle cases where the arguments fall outside the expected valid range.

Common mistake example:

julia> function calculate_sqrt(x)
           if x < 0
               throw(DomainError(x, "Invalid argument"))
           else
               return sqrt(x)
           end
       end

julia> calculate_sqrt(-4)
ERROR: DomainError with -4:
Invalid argument

In this example, the calculate_sqrt function throws a DomainError if the input x is negative. However, if the error is not caught or handled properly, it will cause the program to terminate and display the error message. It's important to handle DomainError appropriately using try-catch blocks or other error handling mechanisms to avoid unexpected program termination.

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