When is it necessary to make changes using backwards compatibility? | Sololearn: Learn to code for FREE!

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When is it necessary to make changes using backwards compatibility?

9/1/2016 2:45:46 PM

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say if u have written a code using a recent version,. and you give ur code to ur friend who has a old machine which support only old version(just for the sake of argument). then even he would get the same outcome as what u got too