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Factorial program in c using recursion

long factorial(int);
int main()
  int n;
  long f;
  printf("Enter an integer to find factorial\n");
  scanf("%d", &n); 
  if (n < 0)
    printf("Negative integers are not allowed.\n");
    f = factorial(n);
    printf("%d! = %ld\n", n, f);
  return 0;
long factorial(int n)
  if (n == 0)
    return 1;
    return(n * factorial(n-1));
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