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- #include <stdio.h>
- #include <stdlib.h>
- #include <assert.h>
- int fac(int);
- int main()
- {
- int n;
- scanf("%d", &n);
- assert(n >= 1 && n <= 9);
- printf("%d\n", fac(n));
- system("pause");
- return 0;
- }
- int fac(int n)
- {
- if(n == 1)
- return 1;
- return n * fac(n-1);
- }
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