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Is 2 + 2=4 in engineering?

Hey guys,
This post is for engineering students.If you are in the first year of engineering then let me tell you that 2+2 can  be 4 or may not be.This is a metaphor meaning 2+2 can be 3.9 or 4.1 but may not be equal to 4.See if you are pursuing mechanical,civil or electrical then your answers may not match the desired value but approximately around it.For eg if you are calculating the tension in a spring caused by a block of wood of 5kg,theoritically the tension should be 49 N under ideal condition.But we know that engineering is not about ideal,it is about practical.So you may get values as 47.5 or 48.Dont worry you have performed the right experiment.But can we always take it for granted that we should not care about exact value.The answer is no.You should always strive for perfection.Suppose you are a civil engineer building a bridge and you are neglecting the difference between required value and achieved value at every support then you may end up with disastrous results.So your aim should always be to get perfection.In an other case if you forget to put a simple comma in the program designed for sending a rocket to space it may result that the rocket may not take off.So your ultimate aim should be to get perfect result but also not worry if certain variation comes at the end.Because sometimes you have to accept it and in other cases rectify it.
Thanks...

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