[algogeeks] why the output 16

[SuDhir mIsHra]

#include<stdio.h>
#define FUNC1(i) (i*(i-1))
#define FUNC2(i) (i==0?1:i*FUNC1(i-1))
main()
{
        int i=8;


        printf("\n%d",FUNC2(i));
}

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