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- #include <stdio.h>
- int double_fact(int n)
- {
- if(n == 0 && n % 2 == 0)
- return 1;
- if(n == 1 && n % 2 != 0)
- return 1;
- else
- return n * double_fact(n - 2);
- }
- int main()
- {
- int n;
- scanf("%d", &n);
- printf("%d", double_fact(n));
- return 0;
- }
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