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definition of gcd for(x,y)

I face gcd in Loops part and I just know that it is a function,but what kind of function?and how we can define it?Could you please help me about it.

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definition of gcd for(x,y)

I face gcd in Loops part and I just know that it is a function,but what kind of function?and how we can define it?Could you please help me about it.