Need code for 16 bit ripple carry adder using four 4 bit ripple carry adder

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would you like a coffee and sugar with it?

This isn't a forum about doing your homework, but if you have started to write something yourself and have some specific questions, then we can help you.

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sure i like to have coffee without sugar,would u mind giving that

this is a homework problem of my son,he asked me

He is not comfortable with my answer,that's the reason i have posted it