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Visio can be used for building use case diagrams,ER diagrams,data flow diagrams for documentation while an application is being developed.

This question is related to the system analysis & design. I think the test data comes from the an already existing system i.e if we are going to deign a new system then the results which we obtained...

This is an eg. of function overloadin since the function names are same & arguments are different.The return types may or may not be the same.Don't get confused with function overriding since that is...