46.輸入一個整數取出偶數位，并按照原來的順序輸出

給定程式中，函數fun的功能是：将形參n中，各位上為偶數的數取出，并按照原來從高到底位的順序組成一個新的數，并作為函數傳回值。

#include<stdio.h>
unsigned long fun(unsigned long n)
{
	unsigned long x = 0, s, i;int t;
	s = n;
	i = 1;
	while (s != 0)
	{
		t = s % 10;
		if (t % 2 == 0)
		{
			x = x + t*i;
			i = i * 10;
		}
		s = s / 10;
	}
	//printf("%ld", x);
	//getchar();
	return x;
}

int main()
{
	unsigned long n = -1;
	while (n > 99999999 || n < 0)
	{
		printf("Please input(0<n<999999999):");
		scanf_s("%ld",&n);
	}
	printf("%ld\n", n);
	getchar();
		printf("\nTheresult is:%ld\n", fun(n));
		getchar();
		return 0;

	
}